diff --git a/ripple-core/src/main/java/com/ripple/core/formats/TxFormat.java b/ripple-core/src/main/java/com/ripple/core/formats/TxFormat.java
index f6ecca8f..a336cb2a 100644
--- a/ripple-core/src/main/java/com/ripple/core/formats/TxFormat.java
+++ b/ripple-core/src/main/java/com/ripple/core/formats/TxFormat.java
@@ -146,4 +146,10 @@ public String name() {
             Field.ReferenceFeeUnits,    Requirement.REQUIRED,
             Field.ReserveBase,          Requirement.REQUIRED,
             Field.ReserveIncrement,     Requirement.REQUIRED);
+    
+   static public TxFormat SignerListSet = new TxFormat(
+            TransactionType.SignerListSet,
+            Field.SignerQuorum,         Requirement.REQUIRED,
+            Field.SignerEntries,    	Requirement.OPTIONAL);
+
 }