diff --git a/include/transport/protocol.proto b/include/transport/protocol.proto
index 316b164eced356897fe30edb26e7610bde6fa5df..8eafcde8d419c9c4274a36d120e0f49e6443c069 100644
--- a/include/transport/protocol.proto
+++ b/include/transport/protocol.proto
@@ -86,6 +86,16 @@ message RoomList {
 	repeated string name = 2;
 }
 
+enum ParticipantFlag {
+	PARTICIPANT_FLAG_NONE = 0;
+	PARTICIPANT_FLAG_MODERATOR = 1;
+	PARTICIPANT_FLAG_CONFLICT = 2;
+	PARTICIPANT_FLAG_BANNED = 4;
+	PARTICIPANT_FLAG_NOT_AUTHORIZED = 8;
+	PARTICIPANT_FLAG_ME = 16;
+	PARTICIPANT_FLAG_KICKED = 32;
+}
+
 message Participant {
 	required string userName = 1;
 	required string room = 2;