diff --git a/lightning/src/ln/channelmanager.rs b/lightning/src/ln/channelmanager.rs
index 414dc1c452c..0ec8bddf656 100644
--- a/lightning/src/ln/channelmanager.rs
+++ b/lightning/src/ln/channelmanager.rs
@@ -5432,6 +5432,10 @@ where
 		}
 	}
 
+	/// Checks whether [`ChannelMonitorUpdate`]s generated by the receipt of a remote
+	/// [`msgs::RevokeAndACK`] should be held for the given channel until some other event
+	/// completes. Note that this needs to happen in the same [`PeerState`] mutex as any release of
+	/// the [`ChannelMonitorUpdate`] in question.
 	fn raa_monitor_updates_held(&self,
 		actions_blocking_raa_monitor_updates: &BTreeMap<[u8; 32], Vec<RAAMonitorUpdateBlockingAction>>,
 		channel_funding_outpoint: OutPoint, counterparty_node_id: PublicKey