diff --git a/ch12_mining.adoc b/ch12_mining.adoc
index f719dbff..964846ab 100644
--- a/ch12_mining.adoc
+++ b/ch12_mining.adoc
@@ -1427,7 +1427,7 @@ proposed and implemented: P2Pool, a peer-to-peer mining pool without a
 central operator.
 
 P2Pool works by decentralizing the functions of the pool server,
-implementing a parallel blockchain-like system called a _share chain_. A
+implementing a parallel blockchain-like system called((("share chains"))) a _share chain_. A
 share chain is a blockchain running at a lower difficulty than the
 Bitcoin blockchain. The share chain allows pool miners to collaborate in
 a decentralized pool by mining shares on the share chain at a rate of