diff --git a/runtime/syntax/proto.vim b/runtime/syntax/proto.vim
new file mode 100644
index 0000000..4d6a77e
--- /dev/null
+++ b/runtime/syntax/proto.vim
@@ -0,0 +1,74 @@
+" syntax file for Protocol Buffers - Google's data interchange format
+"
+" Copyright 2008 Google Inc.  All rights reserved.
+"
+" Permission is hereby granted, free of charge, to any person obtaining a copy
+" of this software and associated documentation files (the "Software"), to deal
+" in the Software without restriction, including without limitation the rights
+" to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+" copies of the Software, and to permit persons to whom the Software is
+" furnished to do so, subject to the following conditions:
+"
+" The above copyright notice and this permission notice shall be included in
+" all copies or substantial portions of the Software.
+"
+" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+" IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+" FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+" AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+" LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+" OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+" THE SOFTWARE.
+"
+" http://code.google.com/p/protobuf/
+
+if version < 600
+  syntax clear
+elseif exists("b:current_syntax")
+  finish
+endif
+
+syn case match
+
+syn keyword protoTodo       contained TODO FIXME XXX
+syn cluster protoCommentGrp contains=protoTodo
+
+syn keyword protoSyntax     syntax import option
+syn keyword protoStructure  package message group
+syn keyword protoRepeat     optional required repeated
+syn keyword protoDefault    default
+syn keyword protoExtend     extend extensions to max
+syn keyword protoRPC        service rpc returns
+
+syn keyword protoType      int32 int64 uint32 uint64 sint32 sint64
+syn keyword protoType      fixed32 fixed64 sfixed32 sfixed64
+syn keyword protoType      float double bool string bytes
+syn keyword protoTypedef   enum
+syn keyword protoBool      true false
+
+syn match   protoInt     /-\?\<\d\+\>/
+syn match   protoInt     /\<0[xX]\x+\>/
+syn match   protoFloat   /\<-\?\d*\(\.\d*\)\?/
+syn region  protoComment start="\/\*" end="\*\/" contains=@protoCommentGrp
+syn region  protoComment start="//" skip="\\$" end="$" keepend contains=@protoCommentGrp
+syn region  protoString  start=/"/ skip=/\\./ end=/"/
+syn region  protoString  start=/'/ skip=/\\./ end=/'/
+
+hi def link protoTodo         Todo
+
+hi def link protoSyntax       Include
+hi def link protoStructure    Structure
+hi def link protoRepeat       Repeat
+hi def link protoDefault      Keyword
+hi def link protoExtend       Keyword
+hi def link protoRPC          Keyword
+hi def link protoType         Type
+hi def link protoTypedef      Typedef
+hi def link protoBool         Boolean
+
+hi def link protoInt          Number
+hi def link protoFloat        Float
+hi def link protoComment      Comment
+hi def link protoString       String
+
+let b:current_syntax = "proto"