--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -1,4 +1,4 @@
-*options.txt*	For Vim version 7.3.  Last change: 2012 Aug 15
+*options.txt*	For Vim version 7.3.  Last change: 2012 Oct 21
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -756,7 +756,7 @@ A jump table for the options with a shor
 			feature}
 	When on and 'termbidi' is off, the required visual character
 	corrections that need to take place for displaying the Arabic language
-	take affect.  Shaping, in essence, gets enabled; the term is a broad
+	take effect.  Shaping, in essence, gets enabled; the term is a broad
 	one which encompasses:
 	  a) the changing/morphing of characters based on their location
 	     within a word (initial, medial, final and stand-alone).
@@ -6119,7 +6119,8 @@ A jump table for the options with a shor
 			local to buffer
 	Number of spaces to use for each step of (auto)indent.  Used for
 	|'cindent'|, |>>|, |<<|, etc.
-	When zero the 'ts' value will be used.
+	When zero the 'ts' value will be used.  Use the |shiftwidth()|
+	function to get the effective shiftwidth value.
 
 						*'shortmess'* *'shm'*
 'shortmess' 'shm'	string	(Vim default "filnxtToO", Vi default: "",
@@ -6383,6 +6384,7 @@ A jump table for the options with a shor
 	of 8, while being able to edit like it is set to 'sts'.  However,
 	commands like "x" still work on the actual characters.
 	When 'sts' is zero, this feature is off.
+	When 'sts' is negative, the value of 'shiftwidth' is used.
 	'softtabstop' is set to 0 when the 'paste' option is set.
 	See also |ins-expandtab|.  When 'expandtab' is not set, the number of
 	spaces is minimized by using <Tab>s.