diff --git a/ch12.asciidoc b/ch12.asciidoc
index 50884fd4..664b3415 100644
--- a/ch12.asciidoc
+++ b/ch12.asciidoc
@@ -59,7 +59,7 @@ Proof-of-Existence (Digital Notary):: ((("digital notary services")))((("Proof o
 
 Kickstarter (Lighthouse):: ((("Kickstarter (Lighthouse)")))Consistency + Atomicity + Integrity. If you sign one input and the output (Integrity) of a fundraiser transaction, others can contribute to the fundraiser but it cannot be spent (Atomicity) until the goal (output value) is funded (Consistency).
 
-Payment Channels:: Quorum of Control + Timelock + No Double Spend + Non-Expiration + Censorship Resistance + Authorization. A multisig 2-of-2 (Quorum) with a timelock (Timelock), used as the "settlement" transaction of a payment channel can be held (Non-Expiration) and spent whenever (Censorship Resistance) by either party (Authorization). The two parties can then create update transactions that double-spend (No Double-Spend) the settlement on a shorter timelock (Timelock).
+Payment Channels:: ((("payment (state) channels", "building blocks (primitives) used in")))Quorum of Control + Timelock + No Double Spend + Non-Expiration + Censorship Resistance + Authorization. A multisig 2-of-2 (Quorum) with a timelock (Timelock), used as the "settlement" transaction of a payment channel can be held (Non-Expiration) and spent whenever (Censorship Resistance) by either party (Authorization). The two parties can then create update transactions that double-spend (No Double-Spend) the settlement on a shorter timelock (Timelock).
 
 === Colored Coins