diff --git a/index.rkt b/index.rkt
index 762d353..b054639 100644
--- a/index.rkt
+++ b/index.rkt
@@ -269,7 +269,7 @@ Now let's use functions that access the syntax object. The source
 information functions are:
 
 @margin-note{@racket[(syntax-source stx)] is returning @racket['eval],
-only becaue of how I'm generating this documentation, using an
+only because of how I'm generating this documentation, using an
 evaluator to run code snippets in Scribble. Normally this would be
 something like "my-file.rkt".}