diff --git a/source/index.rst b/source/index.rst
index e2fcc64..e4fd43d 100644
--- a/source/index.rst
+++ b/source/index.rst
@@ -17,4 +17,4 @@
    10-let-there-be-light
    11-let-there-be-even-more-light
    12-game-hud
-   13-sky-box-and-som-optimizations
\ No newline at end of file
+   13-sky-box-and-some-optimizations
\ No newline at end of file