diff --git a/src/diff.c b/src/diff.c
index 22e18f3..7c5bbd3 100644
--- a/src/diff.c
+++ b/src/diff.c
@@ -1075,6 +1075,7 @@
 
 /*
  * Set options not to show diffs.  For the current window or all windows.
+ * Only in the current tab page.
  */
     void
 ex_diffoff(eap)