diff --git a/ch12_mining.adoc b/ch12_mining.adoc
index 9b8c9796..3cfdacee 100644
--- a/ch12_mining.adoc
+++ b/ch12_mining.adoc
@@ -1028,6 +1028,8 @@ perspective of each node. Eventually everything is synchronized to
 create a common blockchain. Bitcoin reaches consensus every 10 minutes about
 the state of the blockchain as it existed in the _past_.
 
+++++
+<p class="fix_tracking">
 The timestamps set in block headers are set by the miners. There is a
 certain degree of latitude allowed by the consensus rules to account for
 differences in clock accuracy between decentralized nodes. However, this
@@ -1038,6 +1040,8 @@ the block subsidy reserved for future miners.  If they can set their
 times in the past for some blocks, they can use the current time for
 some other blocks, and so again make it look like there's a long time
 between blocks for the purpose of manipulating difficulty.
+</p>
+++++
 
 To prevent manipulation, Bitcoin has two consensus rules.  The first is
 that no node will accept any block with a time further in the future