diff --git a/common/read_peer_msg.h b/common/read_peer_msg.h
index 9e0b5e4dd..ba64d48b4 100644
--- a/common/read_peer_msg.h
+++ b/common/read_peer_msg.h
@@ -59,6 +59,7 @@ bool is_wrong_channel(const u8 *msg, const struct channel_id *expected,
  * handle_peer_gossip_or_error - simple handler for all the above cases.
  * @peer_fd, @gossip_fd, @gossip_store_fd: peer, gossip and gossip_store fds.
  * @cs: the cryptostate (updated)
+ * @channel_id: the channel id of the current channel.
  * @msg: the peer message (only taken if returns true).
  *
  * This returns true if it handled the packet: a gossip packet (forwarded