diff --git a/runtime/doc/undo.txt b/runtime/doc/undo.txt
index 3feac2a..34d8054 100644
--- a/runtime/doc/undo.txt
+++ b/runtime/doc/undo.txt
@@ -1,4 +1,4 @@
-*undo.txt*      For Vim version 8.2.  Last change: 2022 Jun 02
+*undo.txt*      For Vim version 9.0.  Last change: 2022 Jun 02
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar