f - expand docs

Author: jkczyz

lightning/src/blinded_path/mod.rs

@@ -220,6 +220,10 @@ impl BlindedPath {
 
 	/// Attempts to a use a compact representation for the [`IntroductionNode`] by using a directed
 	/// short channel id from a channel in `network_graph` leading to the introduction node.
+	///
+	/// While this may result in a smaller encoding, there is a trade off in that the path may
+	/// become invalid if the channel is closed or hasn't been propagated via gossip. Therefore,
+	/// calling this many not be suitable for long-lived blinded paths.
 	pub fn use_compact_introduction_node(&mut self, network_graph: &ReadOnlyNetworkGraph) {
 		if let IntroductionNode::NodeId(pubkey) = &self.introduction_node {
 			let node_id = NodeId::from_pubkey(pubkey);