--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -1,4 +1,4 @@
-*options.txt*	For Vim version 7.3.  Last change: 2011 Apr 15
+*options.txt*	For Vim version 7.3.  Last change: 2011 Apr 29
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -815,7 +815,7 @@ A jump table for the options with a shor
 	been set.
 
 							*'background'* *'bg'*
-'background' 'bg'	string	(default "dark" or "light")
+'background' 'bg'	string	(default "dark" or "light", see below)
 			global
 			{not in Vi}
 	When set to "dark", Vim will try to use colors that look good on a
@@ -849,6 +849,12 @@ A jump table for the options with a shor
 	color).  To get around this, force the GUI window to be opened by
 	putting a ":gui" command in the .gvimrc file, before where the value
 	of 'background' is used (e.g., before ":syntax on").
+
+	For MS-DOS, Windows and OS/2 the default is "dark".
+	For other systems "dark" is used when 'term' is "linux",
+	"screen.linux", "cygwin" or "putty", or $COLORFGBG suggests a dark
+	background.  Otherwise the default is "light".
+
 	Normally this option would be set in the .vimrc file.  Possibly
 	depending on the terminal name.  Example: >
 		:if &term == "pcterm"
@@ -3094,7 +3100,7 @@ A jump table for the options with a shor
 	closed.  Also for manually closed folds.  With the default value of
 	one a fold can only be closed if it takes up two or more screen lines.
 	Set to zero to be able to close folds of just one screen line.
-	Note that this only has an effect of what is displayed.  After using
+	Note that this only has an effect on what is displayed.  After using
 	"zc" to close a fold, which is displayed open because it's smaller
 	than 'foldminlines', a following "zc" may close a containing fold.