--- a/runtime/doc/editing.txt
+++ b/runtime/doc/editing.txt
@@ -1,4 +1,4 @@
-*editing.txt*   For Vim version 7.3.  Last change: 2010 Dec 08
+*editing.txt*   For Vim version 7.3.  Last change: 2011 Jan 27
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -984,6 +984,11 @@ explanation of when the copy is made and
 If the creation of a backup file fails, the write is not done.  If you want
 to write anyway add a '!' to the command.
 
+							*write-permissions*
+When writing a new file the permissions are read-write.  For unix the mask is
+0666 with additionally umask applied.  When writing a file that was read Vim
+will preserve the permissions, but clear the s-bit.
+
 							*write-readonly*
 When the 'cpoptions' option contains 'W', Vim will refuse to overwrite a
 readonly file.  When 'W' is not present, ":w!" will overwrite a readonly file,