diff --git a/src/diff.c b/src/diff.c
index f560460..cf09140 100644
--- a/src/diff.c
+++ b/src/diff.c
@@ -1110,7 +1110,7 @@
 }
 
 /*
- * Set options to show difs for the current window.
+ * Set options to show diffs for the current window.
  */
     void
 ex_diffthis(eap)