diff --git a/ch06_transactions.adoc b/ch06_transactions.adoc
index cef3a68d..22f50e2a 100644
--- a/ch06_transactions.adoc
+++ b/ch06_transactions.adoc
@@ -100,7 +100,7 @@ change to Bitcoin's consensus rules.  BIP68 places additional
 constraints on the sequence field, but those constraints only apply to
 transactions with version 2 or higher.  Version 1 transactions are
 unaffected.  BIP112, which was part of the same soft fork as BIP68,
-introduced an opcode (++OP_CHECKSEQUENCEVERIFY++), which will now fail if it is
+repurposed OP_NOP3 to introduce a new opcode (++OP_CHECKSEQUENCEVERIFY++), which will now fail if it is
 evaluated as part of a transaction with a version less than 2.  Beyond
 those two changes, version 2 transactions are identical to version 1
 transactions.