f note required buffer as antoine suggested

Author: TheBlueMatt

lightning/src/util/config.rs

@@ -169,9 +169,10 @@ pub struct ChannelConfig {
 	/// [`ChannelHandshakeConfig::our_to_self_delay`] applies to the remaining
 	/// (non-HTLC-encumbered) balance.
 	///
-	/// Thus, for HTLC-encumbered balances to be enforced on-chain, when a channel is force-closed,
+	/// Thus, for HTLC-encumbered balances to be enforced on-chain when a channel is force-closed,
 	/// we (or one of our watchtowers) MUST be online to check for broadcast of the current
-	/// commitment transaction at least once per this many blocks.
+	/// commitment transaction at least once per this many blocks (plus some margin to allow us
+	/// enough time to broadcast and confirm a transaction).
 	///
 	/// Default value: [`MIN_CLTV_EXPIRY_DELTA`], which we enforce as a minimum so you can change
 	/// the config to ask for more security, not less.