diff --git a/ch12_mining.adoc b/ch12_mining.adoc
index 5d025af2..a6f6b43f 100644
--- a/ch12_mining.adoc
+++ b/ch12_mining.adoc
@@ -1791,7 +1791,7 @@ transactions.
 
 ==== Contentious Hard Forks
 
-This is the dawn of the development of software
+This is ((("consensus rules", "hard forks", "contentious forks")))((("forks", "hard forks", "contentious forks")))((("hard forks", "contentious forks")))((("contentious hard forks")))the dawn of the development of software
 for decentralized consensus. Just as other innovations in development changed both the methods
 and products of software and created new methodologies, new tools, and
 new communities in its wake, consensus software development also