f update error message

Author: TheBlueMatt

lightning/src/ln/channel.rs

@@ -867,7 +867,7 @@ impl<Signer: Sign> Channel<Signer> {
 		// of 1.1 sat/vbyte and a receiver that wants 1.1 rounded up to 2. Thus, we always add 250
 		// sat/kw before the comparison here.
 		if feerate_per_kw + 250 < lower_limit {
-			return Err(ChannelError::Close(format!("Peer's feerate much too low. Actual: {}. Our expected lower limit: {}", feerate_per_kw, lower_limit)));
+			return Err(ChannelError::Close(format!("Peer's feerate much too low. Actual: {}. Our expected lower limit: {} (- 250)", feerate_per_kw, lower_limit)));
 		}
 		// We only bound the fee updates on the upper side to prevent completely absurd feerates,
 		// always accepting up to 25 sat/vByte or 10x our fee estimator's "High Priority" fee.