diff --git a/runtime/syntax/rcs.vim b/runtime/syntax/rcs.vim
new file mode 100644
index 0000000..f4a90c6
--- /dev/null
+++ b/runtime/syntax/rcs.vim
@@ -0,0 +1,76 @@
+" Vim syntax file
+" Language:	RCS file
+" Maintainer:	Dmitry Vasiliev <dima@hlabs.spb.ru>
+" URL:		http://www.hlabs.spb.ru/vim/rcs.vim
+" Last Change:	$Date$
+" Filenames:	*,v
+" $Revision$
+"
+" Options:
+" rcs_folding = 1		For folding strings
+
+" 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
+
+" RCS file must end with a newline.
+syn match rcsEOFError	".\%$" containedin=ALL
+
+" Keywords.
+syn keyword rcsKeyword	head branch access symbols locks strict
+syn keyword rcsKeyword	comment expand date author state branches
+syn keyword rcsKeyword	next desc log
+syn keyword rcsKeyword	text nextgroup=rcsTextStr skipwhite skipempty
+
+" Revision numbers and dates.
+syn match rcsNumber	"\<[0-9.]\+\>" display
+
+" Strings.
+if exists("rcs_folding") && has("folding")
+  " Folded strings.
+  syn region rcsString	matchgroup=rcsString start="@" end="@" skip="@@" fold contains=rcsSpecial
+  syn region rcsTextStr	matchgroup=rcsTextStr start="@" end="@" skip="@@" fold contained contains=rcsSpecial,rcsDiffLines
+else
+  syn region rcsString	matchgroup=rcsString start="@" end="@" skip="@@" contains=rcsSpecial
+  syn region rcsTextStr	matchgroup=rcsTextStr start="@" end="@" skip="@@" contained contains=rcsSpecial,rcsDiffLines
+endif
+syn match rcsSpecial	"@@" contained
+syn match rcsDiffLines	"[da]\d\+ \d\+$" contained
+
+" Synchronization.
+syn sync clear
+if exists("rcs_folding") && has("folding")
+  syn sync fromstart
+else
+  " We have incorrect folding if following sync patterns is turned on.
+  syn sync match rcsSync	grouphere rcsString "[0-9.]\+\(\s\|\n\)\+log\(\s\|\n\)\+@"me=e-1
+  syn sync match rcsSync	grouphere rcsTextStr "@\(\s\|\n\)\+text\(\s\|\n\)\+@"me=e-1
+endif
+
+" 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_rcs_syn_inits")
+  if version <= 508
+    let did_rcs_syn_inits = 1
+    command -nargs=+ HiLink hi link <args>
+  else
+    command -nargs=+ HiLink hi def link <args>
+  endif
+
+  HiLink rcsKeyword	Keyword
+  HiLink rcsNumber	Identifier
+  HiLink rcsString	String
+  HiLink rcsTextStr	String
+  HiLink rcsSpecial	Special
+  HiLink rcsDiffLines	Special
+  HiLink rcsEOFError	Error
+
+  delcommand HiLink
+endif
+
+let b:current_syntax = "rcs"