diff --git a/runtime/doc/if_ruby.txt b/runtime/doc/if_ruby.txt
index 0977397..1b4fd40 100644
--- a/runtime/doc/if_ruby.txt
+++ b/runtime/doc/if_ruby.txt
@@ -1,4 +1,4 @@
-*if_ruby.txt*   For Vim version 8.0.  Last change: 2018 Mar 15
+*if_ruby.txt*   For Vim version 8.1.  Last change: 2018 Mar 15
 
 
 		  VIM REFERENCE MANUAL    by Shugo Maeda