diff --git a/ch13_security.adoc b/ch13_security.adoc
index e43dcb65..9f2beb3a 100644
--- a/ch13_security.adoc
+++ b/ch13_security.adoc
@@ -20,7 +20,7 @@ need to think about securing our bitcoins in a novel way too.
 
 === Security Principles
 
-The ((("Bitcoin", "security", "principles of", id="bitcoin-security-principle")))((("security", "principles of", id="security-principle")))core principle in Bitcoin is
+The ((("Bitcoin", "security", "principles of", id="bitcoin-security-principle")))((("security", "principles of", id="security-principle")))((("decentralized consensus", "as security principle", secondary-sortas="security principle", id="decentral-consensus-principle")))core principle in Bitcoin is
 decentralization and it has important implications for security. A
 centralized model, such as a traditional bank or payment network,
 depends on access control and vetting to keep bad actors out of the
@@ -88,7 +88,7 @@ replicates the fragile model of traditional financial networks, plagued
 by identity theft, corruption, and embezzlement. To take advantage of
 Bitcoin's unique decentralized security model, you have to avoid the
 temptation of centralized architectures that might feel familiar but
-ultimately subvert Bitcoin's security.
+ultimately subvert Bitcoin's ((("decentralized consensus", "as security principle", secondary-sortas="security principle", startref="decentral-consensus-principle")))security.
 
 ==== The Root of Trust