diff --git a/Stellar-contract.x b/Stellar-contract.x
index 5623fa9..2bd5c03 100644
--- a/Stellar-contract.x
+++ b/Stellar-contract.x
@@ -187,6 +187,10 @@ enum SCAddressType
     SC_ADDRESS_TYPE_MUXED_ACCOUNT = 2,
     SC_ADDRESS_TYPE_CLAIMABLE_BALANCE = 3,
     SC_ADDRESS_TYPE_LIQUIDITY_POOL = 4
+#ifdef CAP_0084_MUXED_CONTRACT
+    ,
+    SC_ADDRESS_TYPE_MUXED_CONTRACT = 5
+#endif
 };
 
 struct MuxedEd25519Account
@@ -195,6 +199,14 @@ struct MuxedEd25519Account
     uint256 ed25519;
 };
 
+#ifdef CAP_0084_MUXED_CONTRACT
+struct MuxedContract
+{
+    uint64 id;
+    ContractID contractId;
+};
+#endif
+
 union SCAddress switch (SCAddressType type)
 {
 case SC_ADDRESS_TYPE_ACCOUNT:
@@ -207,6 +219,10 @@ case SC_ADDRESS_TYPE_CLAIMABLE_BALANCE:
     ClaimableBalanceID claimableBalanceId;
 case SC_ADDRESS_TYPE_LIQUIDITY_POOL:
     PoolID liquidityPoolId;
+#ifdef CAP_0084_MUXED_CONTRACT
+case SC_ADDRESS_TYPE_MUXED_CONTRACT:
+    MuxedContract muxedContract;
+#endif
 };
 
 #ifdef CAP_0085_EXECUTABLE_REF