updated for version 7.1b
diff --git a/runtime/doc/undo.txt b/runtime/doc/undo.txt
index e1f6585..413143a 100644
--- a/runtime/doc/undo.txt
+++ b/runtime/doc/undo.txt
@@ -1,4 +1,4 @@
-*undo.txt*      For Vim version 7.1a.  Last change: 2006 Apr 30
+*undo.txt*      For Vim version 7.1b.  Last change: 2006 Apr 30
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar