f comments

Author: valentinewallace

lightning/src/ln/onion_utils.rs

@@ -484,11 +484,13 @@ pub(super) fn process_onion_failure<T: secp256k1::Signing, L: Deref>(
 		// The failing hop includes either the inbound channel to the recipient or the outbound channel
 		// from the current hop (i.e., the next hop's inbound channel).
 		let num_blinded_hops = path.blinded_tail.as_ref().map_or(0, |bt| bt.hops.len());
+		// For 1-hop blinded paths, the final `path.hop` is the recipient.
 		is_from_final_node = route_hop_idx + 1 == path.hops.len() && num_blinded_hops <= 1;
 		let failing_route_hop = if is_from_final_node { route_hop } else {
 			match path.hops.get(route_hop_idx + 1) {
 				Some(hop) => hop,
 				None => {
+					// The failing hop is within a multi-hop blinded path.
 					error_code_ret = Some(BADONION | PERM | 24); // invalid_onion_blinding
 					error_packet_ret = Some(vec![0; 32]);
 					res = Some(FailureLearnings {