diff --git a/runtime/doc/os_dos.txt b/runtime/doc/os_dos.txt
index 1306620..8f6b965 100644
--- a/runtime/doc/os_dos.txt
+++ b/runtime/doc/os_dos.txt
@@ -1,4 +1,4 @@
-*os_dos.txt*    For Vim version 7.4a.  Last change: 2006 Mar 30
+*os_dos.txt*    For Vim version 7.4b.  Last change: 2006 Mar 30
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar