diff --git a/ch12_mining.adoc b/ch12_mining.adoc
index 5f447f93..61aa3fd2 100644
--- a/ch12_mining.adoc
+++ b/ch12_mining.adoc
@@ -1181,7 +1181,7 @@ one of the possible chains.
 
 [TIP]
 ====
-The blockchain forks described in this section occur naturally as a
+The blockchain forks ((("blockchain", "forks")))((("forks")))described in this section occur naturally as a
 result of transmission delays in the global network. We will also look
 at deliberately induced forks later in this chapter.
 ====