diff --git a/waku/message/v1/message.proto b/waku/message/v1/message.proto
index 876e43b..b48b22e 100644
--- a/waku/message/v1/message.proto
+++ b/waku/message/v1/message.proto
@@ -8,5 +8,6 @@ message WakuMessage {
   string content_topic = 2;
   optional uint32 version = 3;
   optional sint64 timestamp = 10;
+  optional bytes meta = 11;
   optional bool ephemeral = 31;
 }