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