diff --git a/bitcoin-payment-channel.cabal b/bitcoin-payment-channel.cabal
--- a/bitcoin-payment-channel.cabal
+++ b/bitcoin-payment-channel.cabal
@@ -1,5 +1,5 @@
 name:                 bitcoin-payment-channel
-version:              0.4.0.0
+version:              0.4.0.1
 synopsis:             Library for working with Bitcoin payment channels
 description:
     A Bitcoin payment channel allows secure and instant transfer of bitcoins from one
diff --git a/src/Data/Bitcoin/PaymentChannel.hs b/src/Data/Bitcoin/PaymentChannel.hs
--- a/src/Data/Bitcoin/PaymentChannel.hs
+++ b/src/Data/Bitcoin/PaymentChannel.hs
@@ -8,15 +8,16 @@
 Portability : POSIX
 
 In order to set up a payment channel between a sender and a receiver, the two parties must
- first agree on three parameters for the channel:
+ first agree on four parameters for the channel:
 
     (1) sender public key
     (2) receiver public key
     (3) channel expiration date
+    (4) sender change output "dust limit" (see note [1])
 
  These parameters
- are contained in 'ChannelParameters', from which a channel funding
- address can be derived using
+ are contained in 'ChannelParameters', from which the Bitcoin address used to fund
+ the payment channel can be derived using
  'getFundingAddress'. The transaction which pays to this address is the channel funding
  transaction, and information about it is contained in a 'FundingTxInfo'.
  So, the channel funding transaction will contain an output which pays to the address returned by
@@ -67,6 +68,11 @@
  signing function passed to 'getSettlementBitcoinTx',
 where @receiverPrivKey@ is the private key from which 'cpReceiverPubKey' is derived.
 
+[1] The minimum amount that the server is willing to accept as the client change value in the
+ payment transaction. Set this to 700 and you'll be fine. It's only relevant if the channel is
+ emptied of value completely, but it is necessary because the server doesn't want to accept
+ payments based on transactions it cannot publish via the Bitcoin P2P network, because they
+ contain an output of minuscule value.
 
 __/IMPORTANT:/__ /Channel setup is risk free because the sender can derive a refund Bitcoin transaction/
  /using 'getRefundBitcoinTx', which returns the bitcoins used to fund the channel back to the sender./