diff --git a/proto/users.proto b/proto/users.proto
index 73a2202..4faaef3 100644
--- a/proto/users.proto
+++ b/proto/users.proto
@@ -35,6 +35,7 @@ message User {
 message PatchUserRequest {
   string user_id = 1;
   optional string name = 2;
+  optional string avatar = 3;
 }
 message PatchUserResponse {
   bool ok = 1;