diff --git a/README.md b/README.md
index 5902920..a574749 100644
--- a/README.md
+++ b/README.md
@@ -317,6 +317,7 @@ The values which must be passed between functions have (almost entirely) consist
 	* `is_sweeping: BoolString`
 	* `priority: UInt32String` of `1`–`4`
 	* `fee_per_b: UInt64String`
+	* `fee_mask: UInt64String`
 	* `unspent_outs: [UnspentOutput]` - fully parsed server response
 	* `payment_id_string: Optional<String>`
 	* `passedIn_attemptAt_fee: Optional<UInt64String>`
@@ -354,6 +355,7 @@ The values which must be passed between functions have (almost entirely) consist
 	* `fee_amount: UInt64String` returned by step1
 	* `priority: UInt32String` of `1`–`4`
 	* `fee_per_b: UInt64String`
+	* `fee_mask: UInt64String`
 	* `using_outs: [UnspentOutput]` returned by step1
 	* `mix_outs: [MixAmountAndOuts]` defined below
 	* `unlock_time: UInt64String`