diff --git a/runtime/doc/develop.txt b/runtime/doc/develop.txt
index 9325694..1b1ad85 100644
--- a/runtime/doc/develop.txt
+++ b/runtime/doc/develop.txt
@@ -1,4 +1,4 @@
-*develop.txt*   For Vim version 9.0.  Last change: 2022 Sep 20
+*develop.txt*   For Vim version 9.1.  Last change: 2022 Sep 20
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar