diff --git a/02-peer-protocol.md b/02-peer-protocol.md
index 2057728..20940ca 100644
--- a/02-peer-protocol.md
+++ b/02-peer-protocol.md
@@ -1407,7 +1407,7 @@ a transaction paying more fees to make the channel confirm faster.
 #### Requirements
 
 The sender of `tx_init_rbf`:
-  - MUST be the *initiator*
+  - MAY be the either the *initiator* or the *accepter*
   - MUST NOT have sent or received a `channel_ready` message.
 
 The recipient:
@@ -1430,6 +1430,10 @@ a large feerate change, instead sets their `sats` to zero, and decline to
 participate further in the channel funding: by not contributing, they
 may obtain incoming liquidity at no cost.
 
+We allow both nodes to initiate RBF, because any one of them may want to take
+this opportunity to contribute additional funds to the channel without
+waiting for the initial funding transaction to confirm.
+
 ## Channel Quiescence
 
 Various fundamental changes, in particular protocol upgrades, are