f add link

Author: valentinewallace

lightning/src/blinded_path/payment.rs

@@ -220,7 +220,8 @@ mod tests {
 
 	#[test]
 	fn compute_payinfo() {
-		// Taken from the spec example for aggregating blinded payment info.
+		// Taken from the spec example for aggregating blinded payment info. See
+		// https://github.com/lightning/bolts/blob/master/proposals/route-blinding.md#blinded-payments
 		let dummy_pk = PublicKey::from_slice(&[2; 33]).unwrap();
 		let path = vec![(dummy_pk, BlindedPaymentTlvs::Forward {
 			short_channel_id: 0,