diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index ca3f4ca..83a8995 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -1943,10 +1943,29 @@
 		autocommand.
 						    *v:option_old*
 v:option_old    Old value of the option. Valid while executing an |OptionSet|
-		autocommand.
+		autocommand. Depending on the command used for setting and the
+		kind of option this is either the local old value or the
+		global old value.
+						    *v:option_oldlocal*
+v:option_oldlocal
+		Old local value of the option. Valid while executing an
+		|OptionSet| autocommand.
+						    *v:option_oldglobal*
+v:option_oldglobal
+		Old global value of the option. Valid while executing an
+		|OptionSet| autocommand.
 						    *v:option_type*
 v:option_type   Scope of the set command. Valid while executing an
 		|OptionSet| autocommand. Can be either "global" or "local"
+						    *v:option_command*
+v:option_command
+		Command used to set the option. Valid while executing an
+		|OptionSet| autocommand.
+			value		option was set via   ~
+			"setlocal"	|:setlocal| or ":let l:xxx"
+			"setglobal"	|:setglobal| or ":let g:xxx"
+			"set"		|:set| or |:let|
+			"modeline"	|modeline|
 					*v:operator* *operator-variable*
 v:operator	The last operator given in Normal mode.  This is a single
 		character except for commands starting with <g> or <z>,