diff --git a/proxy/src/main/java/com/velocitypowered/proxy/command/CommandGraphInjector.java b/proxy/src/main/java/com/velocitypowered/proxy/command/CommandGraphInjector.java
index 8ea2d577..7e2e55a9 100644
--- a/proxy/src/main/java/com/velocitypowered/proxy/command/CommandGraphInjector.java
+++ b/proxy/src/main/java/com/velocitypowered/proxy/command/CommandGraphInjector.java
@@ -1,3 +1,20 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.velocitypowered.proxy.command;
 
 import com.google.common.base.Preconditions;
diff --git a/proxy/src/main/java/com/velocitypowered/proxy/command/VelocityCommands.java b/proxy/src/main/java/com/velocitypowered/proxy/command/VelocityCommands.java
index 9d903aa4..262812f2 100644
--- a/proxy/src/main/java/com/velocitypowered/proxy/command/VelocityCommands.java
+++ b/proxy/src/main/java/com/velocitypowered/proxy/command/VelocityCommands.java
@@ -1,3 +1,20 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.velocitypowered.proxy.command;
 
 import com.google.common.base.Preconditions;
diff --git a/proxy/src/main/java/com/velocitypowered/proxy/command/brigadier/StringArrayArgumentType.java b/proxy/src/main/java/com/velocitypowered/proxy/command/brigadier/StringArrayArgumentType.java
index 4b482a90..eefeec46 100644
--- a/proxy/src/main/java/com/velocitypowered/proxy/command/brigadier/StringArrayArgumentType.java
+++ b/proxy/src/main/java/com/velocitypowered/proxy/command/brigadier/StringArrayArgumentType.java
@@ -1,3 +1,20 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.velocitypowered.proxy.command.brigadier;
 
 import com.google.common.base.Splitter;
diff --git a/proxy/src/main/java/com/velocitypowered/proxy/command/brigadier/VelocityArgumentBuilder.java b/proxy/src/main/java/com/velocitypowered/proxy/command/brigadier/VelocityArgumentBuilder.java
index 3f1c1956..d3f2506d 100644
--- a/proxy/src/main/java/com/velocitypowered/proxy/command/brigadier/VelocityArgumentBuilder.java
+++ b/proxy/src/main/java/com/velocitypowered/proxy/command/brigadier/VelocityArgumentBuilder.java
@@ -1,3 +1,20 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.velocitypowered.proxy.command.brigadier;
 
 import com.google.common.base.Preconditions;
diff --git a/proxy/src/main/java/com/velocitypowered/proxy/command/brigadier/VelocityArgumentCommandNode.java b/proxy/src/main/java/com/velocitypowered/proxy/command/brigadier/VelocityArgumentCommandNode.java
index f8c0299c..26262193 100644
--- a/proxy/src/main/java/com/velocitypowered/proxy/command/brigadier/VelocityArgumentCommandNode.java
+++ b/proxy/src/main/java/com/velocitypowered/proxy/command/brigadier/VelocityArgumentCommandNode.java
@@ -1,3 +1,20 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.velocitypowered.proxy.command.brigadier;
 
 import com.google.common.base.Preconditions;
diff --git a/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/AbstractCommandRegistrar.java b/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/AbstractCommandRegistrar.java
index c4a767be..c5fa6f46 100644
--- a/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/AbstractCommandRegistrar.java
+++ b/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/AbstractCommandRegistrar.java
@@ -1,3 +1,20 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.velocitypowered.proxy.command.registrar;
 
 import com.google.common.base.Preconditions;
diff --git a/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/BrigadierCommandRegistrar.java b/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/BrigadierCommandRegistrar.java
index 66ce113a..0739f2b7 100644
--- a/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/BrigadierCommandRegistrar.java
+++ b/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/BrigadierCommandRegistrar.java
@@ -1,3 +1,20 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.velocitypowered.proxy.command.registrar;
 
 import com.mojang.brigadier.tree.LiteralCommandNode;
diff --git a/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/CommandRegistrar.java b/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/CommandRegistrar.java
index ea9200e0..b2d9051f 100644
--- a/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/CommandRegistrar.java
+++ b/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/CommandRegistrar.java
@@ -1,3 +1,20 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.velocitypowered.proxy.command.registrar;
 
 import com.mojang.brigadier.tree.LiteralCommandNode;
diff --git a/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/InvocableCommandRegistrar.java b/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/InvocableCommandRegistrar.java
index fd7ba027..423cf3cc 100644
--- a/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/InvocableCommandRegistrar.java
+++ b/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/InvocableCommandRegistrar.java
@@ -1,3 +1,20 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.velocitypowered.proxy.command.registrar;
 
 import com.google.common.base.Preconditions;
diff --git a/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/RawCommandRegistrar.java b/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/RawCommandRegistrar.java
index 25e6acbd..2c1e8f10 100644
--- a/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/RawCommandRegistrar.java
+++ b/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/RawCommandRegistrar.java
@@ -1,3 +1,20 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.velocitypowered.proxy.command.registrar;
 
 import com.mojang.brigadier.arguments.StringArgumentType;
diff --git a/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/SimpleCommandRegistrar.java b/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/SimpleCommandRegistrar.java
index b0b15857..bfd4ef43 100644
--- a/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/SimpleCommandRegistrar.java
+++ b/proxy/src/main/java/com/velocitypowered/proxy/command/registrar/SimpleCommandRegistrar.java
@@ -1,3 +1,20 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.velocitypowered.proxy.command.registrar;
 
 import com.mojang.brigadier.tree.RootCommandNode;
diff --git a/proxy/src/test/java/com/velocitypowered/proxy/command/CommandGraphInjectorTests.java b/proxy/src/test/java/com/velocitypowered/proxy/command/CommandGraphInjectorTests.java
index e843cf54..d5c27c5d 100644
--- a/proxy/src/test/java/com/velocitypowered/proxy/command/CommandGraphInjectorTests.java
+++ b/proxy/src/test/java/com/velocitypowered/proxy/command/CommandGraphInjectorTests.java
@@ -1,3 +1,20 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.velocitypowered.proxy.command;
 
 import com.mojang.brigadier.CommandDispatcher;
diff --git a/proxy/src/test/java/com/velocitypowered/proxy/command/SuggestionsProviderTests.java b/proxy/src/test/java/com/velocitypowered/proxy/command/SuggestionsProviderTests.java
index b3d37c24..bc4b9e10 100644
--- a/proxy/src/test/java/com/velocitypowered/proxy/command/SuggestionsProviderTests.java
+++ b/proxy/src/test/java/com/velocitypowered/proxy/command/SuggestionsProviderTests.java
@@ -1,3 +1,20 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.velocitypowered.proxy.command;
 
 public class SuggestionsProviderTests {
diff --git a/proxy/src/test/java/com/velocitypowered/proxy/command/brigadier/StringArrayArgumentTypeTests.java b/proxy/src/test/java/com/velocitypowered/proxy/command/brigadier/StringArrayArgumentTypeTests.java
index 64769b1a..d33d4a16 100644
--- a/proxy/src/test/java/com/velocitypowered/proxy/command/brigadier/StringArrayArgumentTypeTests.java
+++ b/proxy/src/test/java/com/velocitypowered/proxy/command/brigadier/StringArrayArgumentTypeTests.java
@@ -1,3 +1,20 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.velocitypowered.proxy.command.brigadier;
 
 import static org.junit.jupiter.api.Assertions.assertArrayEquals;
diff --git a/proxy/src/test/java/com/velocitypowered/proxy/command/brigadier/VelocityArgumentCommandNodeTests.java b/proxy/src/test/java/com/velocitypowered/proxy/command/brigadier/VelocityArgumentCommandNodeTests.java
index dfbf2037..b61d0653 100644
--- a/proxy/src/test/java/com/velocitypowered/proxy/command/brigadier/VelocityArgumentCommandNodeTests.java
+++ b/proxy/src/test/java/com/velocitypowered/proxy/command/brigadier/VelocityArgumentCommandNodeTests.java
@@ -1,3 +1,20 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.velocitypowered.proxy.command.brigadier;
 
 import static com.velocitypowered.proxy.command.brigadier.VelocityArgumentBuilder.velocityArgument;