diff --git a/runtime/doc/undo.txt b/runtime/doc/undo.txt
index 22bc586..9a38995 100644
--- a/runtime/doc/undo.txt
+++ b/runtime/doc/undo.txt
@@ -1,4 +1,4 @@
-*undo.txt*      For Vim version 7.4a.  Last change: 2012 Mar 04
+*undo.txt*      For Vim version 7.4b.  Last change: 2012 Mar 04
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar