down-integrate internal changes
diff --git a/editors/proto.vim b/editors/proto.vim
index 23085a2..7f1aeb7 100644
--- a/editors/proto.vim
+++ b/editors/proto.vim
@@ -57,7 +57,7 @@
syn keyword pbStructure package message group oneof
syn keyword pbRepeat optional required repeated
syn keyword pbDefault default
-syn keyword pbExtend extend extensions to max
+syn keyword pbExtend extend extensions to max reserved
syn keyword pbRPC service rpc returns
syn keyword pbType int32 int64 uint32 uint64 sint32 sint64