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*
diff --git a/runtime/syntax/diff.vim b/runtime/syntax/diff.vim
index b5c3f5e..b0a8594 100644
--- a/runtime/syntax/diff.vim
+++ b/runtime/syntax/diff.vim
@@ -378,9 +378,9 @@
 hi def link diffIsA		Constant
 hi def link diffNoEOL		Constant
 hi def link diffCommon		Constant
-hi def link diffRemoved		DiffDelete
-hi def link diffChanged		DiffChange
-hi def link diffAdded		DiffAdd
+hi def link diffRemoved		Removed
+hi def link diffChanged		Changed
+hi def link diffAdded		Added
 hi def link diffLine		Statement
 hi def link diffSubname		PreProc
 hi def link diffComment		Comment
diff --git a/runtime/syntax/help.vim b/runtime/syntax/help.vim
index b734c2c..2024d38 100644
--- a/runtime/syntax/help.vim
+++ b/runtime/syntax/help.vim
@@ -141,6 +141,10 @@
 
 syn match helpURL `\v<(((https?|ftp|gopher)://|(mailto|file|news):)[^' 	<>"]+|(www|web|w3)[a-z0-9_-]*\.[a-z0-9._-]+\.[^' 	<>"]+)[a-zA-Z0-9/]`
 
+syn match helpDiffAdded		"\t[* ]Added\t\+[a-z].*"
+syn match helpDiffChanged	"\t[* ]Changed\t\+[a-z].*"
+syn match helpDiffRemoved	"\t[* ]Removed\t\+[a-z].*"
+
 " Additionally load a language-specific syntax file "help_ab.vim".
 let s:i = match(expand("%"), '\.\a\ax$')
 if s:i > 0
@@ -216,6 +220,9 @@
 hi def link helpError		Error
 hi def link helpTodo		Todo
 hi def link helpURL		String
+hi def link helpDiffAdded	Added
+hi def link helpDiffChanged	Changed
+hi def link helpDiffRemoved	Removed
 
 if has('textprop') && expand('%:p') =~ '[/\\]doc[/\\]syntax.txt'
   " highlight groups with their respective color
diff --git a/runtime/syntax/syncolor.vim b/runtime/syntax/syncolor.vim
index 6cf38cf..52b3a0b 100644
--- a/runtime/syntax/syncolor.vim
+++ b/runtime/syntax/syncolor.vim
@@ -41,6 +41,9 @@
   SynColor Type		term=underline cterm=NONE ctermfg=LightGreen ctermbg=NONE gui=bold guifg=#60ff60 guibg=NONE
   SynColor Underlined	term=underline cterm=underline ctermfg=LightBlue gui=underline guifg=#80a0ff
   SynColor Ignore	term=NONE cterm=NONE ctermfg=black ctermbg=NONE gui=NONE guifg=bg guibg=NONE
+  SynColor Added	term=NONE cterm=NONE ctermfg=Green ctermbg=NONE gui=NONE guifg=LimeGreen guibg=NONE
+  SynColor Changed	term=NONE cterm=NONE ctermfg=Blue ctermbg=NONE gui=NONE guifg=DodgerBlue guibg=NONE
+  SynColor Removed	term=NONE cterm=NONE ctermfg=Red ctermbg=NONE gui=NONE guifg=Red guibg=NONE
 else
   SynColor Comment	term=bold cterm=NONE ctermfg=DarkBlue ctermbg=NONE gui=NONE guifg=Blue guibg=NONE
   SynColor Constant	term=underline cterm=NONE ctermfg=DarkRed ctermbg=NONE gui=NONE guifg=Magenta guibg=NONE
@@ -53,6 +56,9 @@
   SynColor Type		term=underline cterm=NONE ctermfg=DarkGreen ctermbg=NONE gui=bold guifg=SeaGreen guibg=NONE
   SynColor Underlined	term=underline cterm=underline ctermfg=DarkMagenta gui=underline guifg=SlateBlue
   SynColor Ignore	term=NONE cterm=NONE ctermfg=white ctermbg=NONE gui=NONE guifg=bg guibg=NONE
+  SynColor Added	term=NONE cterm=NONE ctermfg=DarkGreen ctermbg=NONE gui=NONE guifg=SeaGreen guibg=NONE
+  SynColor Changed	term=NONE cterm=NONE ctermfg=Blue ctermbg=NONE gui=NONE guifg=DodgerBlue guibg=NONE
+  SynColor Removed	term=NONE cterm=NONE ctermfg=Red ctermbg=NONE gui=NONE guifg=Red guibg=NONE
 endif
 SynColor Error		term=reverse cterm=NONE ctermfg=White ctermbg=Red gui=NONE guifg=White guibg=Red
 SynColor Todo		term=standout cterm=NONE ctermfg=Black ctermbg=Yellow gui=NONE guifg=Blue guibg=Yellow