diff --git a/runtime/doc/autocmd.txt b/runtime/doc/autocmd.txt
index 63d166d..4d18b78 100644
--- a/runtime/doc/autocmd.txt
+++ b/runtime/doc/autocmd.txt
@@ -366,6 +366,8 @@
 |InsertCharPre|		when a character was typed in Insert mode, before
 			inserting it
 
+|ModeChanged|		after changing the mode
+
 |TextChanged|		after a change was made to the text in Normal mode
 |TextChangedI|		after a change was made to the text in Insert mode
 			when popup menu is not visible
@@ -925,7 +927,22 @@
 					i	Insert
 					c	Command line
 					tl	Terminal
-							*OptionSet*
+							*ModeChanged*
+ModeChanged			After changing the mode. The pattern is
+				matched against `'old_mode:new_mode'`, for
+				example match against `i:*` to simulate
+				|InsertLeave|.
+				The following values of |v:event| are set:
+				   old_mode	The mode before it changed.
+				   new_mode	The new mode as also returned
+						by |mode()|.
+				When ModeChanged is triggered, old_mode will
+				have the value of new_mode when the event was
+				last triggered.
+				Usage example to use relative line numbers
+				when entering visual mode: >
+	:autocmd ModeChanged *:v set relativenumber
+<							*OptionSet*
 OptionSet			After setting an option.  The pattern is
 				matched against the long option name.
 				|<amatch>| indicates what option has been set.