diff --git a/ch11_blockchain.adoc b/ch11_blockchain.adoc
index cbafc15f..4aa0ff00 100644
--- a/ch11_blockchain.adoc
+++ b/ch11_blockchain.adoc
@@ -22,13 +22,13 @@ blocks stacked on top of each other results in the use of terms such as
 Each block
 within the blockchain is identified by a hash, generated using the
 SHA256 cryptographic hash algorithm on the header of the block. Each
-block also commits to the previous block, known as the _parent_ block,
+block also commits to the previous block, known as ((("parent blocks")))the _parent_ block,
 through the "previous block hash" field in the block header.
 The sequence of hashes linking each block to its parent creates a chain
-going back all the way to the first block ever created, known as the
+going back all the way to the first block ever created, known ((("genesis block")))as the
 _genesis block_.
 
-Although a block has just one parent, it can have multiple
+Although a block has just one parent, it can have ((("child blocks")))multiple
 children. Each of the children commits to the same parent block.
 Multiple children arise during a blockchain "fork," a temporary
 situation that can occur when different blocks are discovered almost