diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index 3f2aea9..084c76e 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -1,4 +1,4 @@
-*builtin.txt*	For Vim version 9.0.  Last change: 2023 Dec 24
+*builtin.txt*	For Vim version 9.1.  Last change: 2023 Dec 24
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar