diff --git a/protocol/blockchain/block/transaction-ordering.md b/protocol/blockchain/block/transaction-ordering.md
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--- a/protocol/blockchain/block/transaction-ordering.md
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@@ -1,8 +1,8 @@
 # Transaction Ordering
 
+Transactions in a block are inherently ordered by virtue of their inclusion in the [merkle tree](/protocol/blockchain/block/merkle-tree).  Furthermore, the [coinbase transaction](/protocol/blockchain/block#coinbase-transaction).
 
 ## Canonical Transaction Ordering (CTOR)
 
 
 ## Legacy Transaction Ordering
-