diff --git a/runtime/doc/debug.txt b/runtime/doc/debug.txt
index 6fd88b6..1d3090a 100644
--- a/runtime/doc/debug.txt
+++ b/runtime/doc/debug.txt
@@ -1,4 +1,4 @@
-*debug.txt*     For Vim version 9.0.  Last change: 2019 May 07
+*debug.txt*     For Vim version 9.1.  Last change: 2019 May 07
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar