diff --git a/README.md b/README.md
index eeaf39d..63a88ea 100644
--- a/README.md
+++ b/README.md
@@ -333,6 +333,7 @@ This section defines the fields that are used to construct transaction messages.
 + Current Valid values:
     *    0: [Simple Send](#transfer-coins-simple-send)
     *    3: [Send To Owners](#send-to-owners)
+    *    4: [Send All](#transfer-all-coins-send-all)
     *   20: [Sell Coins for Bitcoins (currency trade offer)](#sell-mastercoins-for-bitcoins)
     *   21: [Offer/Accept Omni Protocol Coins for Another Omni Protocol Currency (currency trade offer)](#sell-omni-protocol-coins-for-another-omni-protocol-currency)
     *   22: [Purchase Coins with Bitcoins (accept currency trade offer)](#purchase-mastercoins-with-bitcoins)
@@ -404,6 +405,23 @@ Say you want to transfer 1 Mastercoin to another address. Only 16 bytes are need
 |Currency identifier| [Currency identifier](#field-currency-identifier) |1 (Mastercoin)|
 |Amount to transfer|[Number of Coins](#field-number-of-coins)|100,000,000 (1.0 coins) |
 
+### Transfer All Coins (Send All)
+
+Description: Transaction type 4 transfers all coins from the sending address to the reference address, defined in [Appendix A](#appendix-a-storing-omni-protocol-data-in-the-blockchain). This transaction can not be used to transfer bitcoins.
+
+In addition to the validity constraints on the message field datatypes, the transaction is invalid if any of the following conditions is true:
+* the sending address has zero coins in all omni currencies
+
+A Send All to a non-existent address will destroy the coins in question, just like it would with bitcoin.
+
+The data stored is:
+
+| **Field** | **Type** | **Example** |
+| ---- | ---- | ---- |
+| Transaction version |[Transaction version](#field-transaction-version) | 0 |
+| Transaction type | [Transaction type](#field-transaction-type) | 0 | 
+
+
 ### Send To Owners
 
 Description: Transaction type 3 transfers coins in the specified currency from the sending address to the current owners of that currency. The current owners are all the addresses, excluding the sender's address, that have a non-zero balance of the specified currency when the transaction message is processed. The Amount to transfer must be divided proportionally among the current owners based upon each owner's current available balance plus reserved amount, excluding the amount owned by the sender.
@@ -445,6 +463,8 @@ The Omni Protocol allows users to trade coins without trusting a centralized web
 
 Consequently, the messages below are different for mastercoin/bitcoin exchange than they are for exchange between mastercoin and other Omni Protocol currencies, and the resulting UI must also be different, reflecting both the one-sided nature of bitcoin/mastercoin exchange as well as the additional anti-spam fees and race conditions inherent in the system.
 
+
+
 ### Sell Mastercoins for Bitcoins
 
 Description: Transaction type 20 posts the terms of an offer to sell Mastercoins or Test Mastercoins for bitcoins. A new sell offer is created with Action = 1 (New). Valid currency identifier values for this transaction are 1 for MSC or 2 for Test MSC.