diff --git a/runtime/syntax/diff.vim b/runtime/syntax/diff.vim
new file mode 100644
index 0000000..2461abe
--- /dev/null
+++ b/runtime/syntax/diff.vim
@@ -0,0 +1,78 @@
+" Vim syntax file
+" Language:	Diff (context or unified)
+" Maintainer:	Bram Moolenaar <Bram@vim.org>
+" Last Change:	2003 Apr 02
+
+" For version 5.x: Clear all syntax items
+" For version 6.x: Quit when a syntax file was already loaded
+if version < 600
+  syntax clear
+elseif exists("b:current_syntax")
+  finish
+endif
+
+syn match diffOnly	"^Only in .*"
+syn match diffIdentical	"^Files .* and .* are identical$"
+syn match diffDiffer	"^Files .* and .* differ$"
+syn match diffBDiffer	"^Binary files .* and .* differ$"
+syn match diffIsA	"^File .* is a .* while file .* is a .*"
+syn match diffNoEOL	"^No newline at end of file .*"
+syn match diffCommon	"^Common subdirectories: .*"
+
+syn match diffRemoved	"^-.*"
+syn match diffRemoved	"^<.*"
+syn match diffAdded	"^+.*"
+syn match diffAdded	"^>.*"
+syn match diffChanged	"^! .*"
+
+syn match diffSubname	" @@..*"ms=s+3 contained
+syn match diffLine	"^@.*" contains=diffSubname
+syn match diffLine	"^\<\d\+\>.*"
+syn match diffLine	"^\*\*\*\*.*"
+
+"Some versions of diff have lines like "#c#" and "#d#" (where # is a number)
+syn match diffLine	"^\d\+\(,\d\+\)\=[cda]\d\+\>.*"
+
+syn match diffFile	"^diff.*"
+syn match diffFile	"^+++ .*"
+syn match diffFile	"^Index: .*$"
+syn match diffFile	"^==== .*$"
+syn match diffOldFile	"^\*\*\* .*"
+syn match diffNewFile	"^--- .*"
+
+syn match diffComment	"^#.*"
+
+" Define the default highlighting.
+" For version 5.7 and earlier: only when not done already
+" For version 5.8 and later: only when an item doesn't have highlighting yet
+if version >= 508 || !exists("did_diff_syntax_inits")
+  if version < 508
+    let did_diff_syntax_inits = 1
+    command -nargs=+ HiLink hi link <args>
+  else
+    command -nargs=+ HiLink hi def link <args>
+  endif
+
+  HiLink diffOldFile	diffFile
+  HiLink diffNewFile	diffFile
+  HiLink diffFile	Type
+  HiLink diffOnly	Constant
+  HiLink diffIdentical	Constant
+  HiLink diffDiffer	Constant
+  HiLink diffBDiffer	Constant
+  HiLink diffIsA	Constant
+  HiLink diffNoEOL	Constant
+  HiLink diffCommon	Constant
+  HiLink diffRemoved	Special
+  HiLink diffChanged	PreProc
+  HiLink diffAdded	Identifier
+  HiLink diffLine	Statement
+  HiLink diffSubname	PreProc
+  HiLink diffComment	Comment
+
+  delcommand HiLink
+endif
+
+let b:current_syntax = "diff"
+
+" vim: ts=8 sw=2