Document channel reserve behavior a bit better

diff --git a/src/ln/channel.rs b/src/ln/channel.rs
index b3271d531393de217c72fe7a6412b46d3aad0cd9..2dc7750e472be7d02a1a85fc2d109cb3a7031a67 100644 (file)
--- a/src/ln/channel.rs
+++ b/src/ln/channel.rs
@@ -330,6 +330,7 @@ pub(super) struct Channel {
        our_dust_limit_satoshis: u64,
        their_max_htlc_value_in_flight_msat: u64,
        //get_our_max_htlc_value_in_flight_msat(): u64,
+       /// minimum channel reserve for **self** to maintain - set by them.
        their_channel_reserve_satoshis: u64,
        //get_our_channel_reserve_satoshis(): u64,
        their_htlc_minimum_msat: u64,
@@ -402,6 +403,8 @@ impl Channel {
                channel_value_satoshis * 1000 / 10 //TODO
        }
 
+       /// Returns a minimum channel reserve value **they** need to maintain
+       ///
        /// Guaranteed to return a value no larger than channel_value_satoshis
        fn get_our_channel_reserve_satoshis(channel_value_satoshis: u64) -> u64 {
                let (q, _) = channel_value_satoshis.overflowing_div(100);
@@ -2742,7 +2745,8 @@ impl Channel {
                        }
                }
 
-               // Check self.their_channel_reserve_satoshis (i.e our channel reserve):
+               // Check self.their_channel_reserve_satoshis (the amount we must keep as
+               // reserve for them to have something to claim if we misbehave)
                if self.value_to_self_msat < self.their_channel_reserve_satoshis * 1000 + amount_msat + holding_cell_outbound_amount_msat + htlc_outbound_value_msat {
                        return Err(HandleError{err: "Cannot send value that would put us over our reserve value", action: None});
                }