diff --git a/runtime/doc/syntax.txt b/runtime/doc/syntax.txt
index c4964bc..fdafb67 100644
--- a/runtime/doc/syntax.txt
+++ b/runtime/doc/syntax.txt
@@ -1,4 +1,4 @@
-*syntax.txt*	For Vim version 7.4.  Last change: 2015 Jan 07
+*syntax.txt*	For Vim version 7.4.  Last change: 2015 Feb 03
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -1135,6 +1135,8 @@
 
 	:let diff_translations = 0
 
+Also see |diff-slow|.
+
 
 DIRCOLORS			       *dircolors.vim* *ft-dircolors-syntax*