diff --git a/runtime/doc/syntax.txt b/runtime/doc/syntax.txt
index cc293a5..6715f65 100644
--- a/runtime/doc/syntax.txt
+++ b/runtime/doc/syntax.txt
@@ -1,4 +1,4 @@
-*syntax.txt*	For Vim version 9.1.  Last change: 2024 Jan 03
+*syntax.txt*	For Vim version 9.1.  Last change: 2024 Jan 06
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -271,6 +271,10 @@
 	*Todo		anything that needs extra attention; mostly the
 			keywords TODO FIXME and XXX
 
+	*Added		added line in a diff
+	*Changed	changed line in a diff
+	*Removed	removed line in a diff
+
 The names marked with * are the preferred groups; the others are minor groups.
 For the preferred groups, the "syntax.vim" file contains default highlighting.
 The minor groups are linked to the preferred groups, so they get the same
@@ -1261,7 +1265,7 @@
 g:desktop_enable_kde follows g:desktop_enable_nonstd if not supplied
 
 
-DIFF						*diff.vim* *ft-diff-syntax*
+DIFF							*diff.vim*
 
 The diff highlighting normally finds translated headers.  This can be slow if
 there are very long lines in the file.  To disable translations: >
@@ -1270,15 +1274,6 @@
 
 Also see |diff-slow|.
 
-Since the Vim 9.1 release |version-9.1| the diff filetype links the diffAdded,
-diffRemoved and diffChanged highlighting groups to |hl-DiffAdd|,
-|hl-DiffDelete| and |hl-DiffChange| by default.  If you do not want this, you
-can change it to the previous groups like this in your |.vimrc| >
-
-	hi link diffRemoved Special
-	hi link diffChanged PreProc
-	hi link diffAdded Identifier
-<
 DIRCOLORS			       *dircolors.vim* *ft-dircolors-syntax*
 
 The dircolors utility highlighting definition has one option.  It exists to
diff --git a/runtime/doc/tags b/runtime/doc/tags
index 5b9e5a9..1b55fa1 100644
--- a/runtime/doc/tags
+++ b/runtime/doc/tags
@@ -7207,7 +7207,6 @@
 ft-dart-syntax	syntax.txt	/*ft-dart-syntax*
 ft-dash-syntax	syntax.txt	/*ft-dash-syntax*
 ft-desktop-syntax	syntax.txt	/*ft-desktop-syntax*
-ft-diff-syntax	syntax.txt	/*ft-diff-syntax*
 ft-dircolors-syntax	syntax.txt	/*ft-dircolors-syntax*
 ft-docbk-syntax	syntax.txt	/*ft-docbk-syntax*
 ft-docbksgml-syntax	syntax.txt	/*ft-docbksgml-syntax*