diff --git a/runtime/doc/os_390.txt b/runtime/doc/os_390.txt
index 9e3f9cb..818b3c7 100644
--- a/runtime/doc/os_390.txt
+++ b/runtime/doc/os_390.txt
@@ -1,4 +1,4 @@
-*os_390.txt*    For Vim version 7.4a.  Last change: 2010 May 30
+*os_390.txt*    For Vim version 7.4b.  Last change: 2010 May 30
 
 
 		  VIM REFERENCE MANUAL	  by Ralf Schandl