diff --git a/ch12.asciidoc b/ch12.asciidoc
index f1e5a4e3..910f51a9 100644
--- a/ch12.asciidoc
+++ b/ch12.asciidoc
@@ -132,7 +132,7 @@ As you can see, coinprism shows the issuance of 20 units of "Free copy of Master
 Any funds or colored assets sent to this address will be lost forever. Do not send value to this example address!
 ====
 
-The transaction ID of the issuance transaction is a "normal" bitcoin transaction ID. <<the_issuance_transaction_on_a_block>> shows that same transaction in a block explorer that doesn't decode colored coins. We'll use blockchain.info:
+((("transaction IDs (txid)")))The transaction ID of the issuance transaction is a "normal" bitcoin transaction ID. <<the_issuance_transaction_on_a_block>> shows that same transaction in a block explorer that doesn't decode colored coins. We'll use blockchain.info:
 
 https://blockchain.info/tx/10d7c4e022f35288779be6713471151ede967caaa39eecd35296aa36d9c109ec[https://blockchain.info/tx/10d7c4e022f35288779be6713471151ede967caaa39eecd35296aa36d9c109ec]