diff --git a/ch12_mining.adoc b/ch12_mining.adoc
index 1e6cdfb2..ad07ce90 100644
--- a/ch12_mining.adoc
+++ b/ch12_mining.adoc
@@ -1284,7 +1284,7 @@ entire left flank of the merkle tree up to ((("bitcoins", "mining", "extra nonce
 [[mining_pools]]
 ==== Mining Pools
 
-In this highly competitive environment, individual miners working
+In this ((("bitcoins", "mining", "mining pools", id="bitcoin-mining-pools")))((("mining", "mining pools", id="mining-mining-pools")))((("mining pools", id="mining-pools")))highly competitive environment, individual miners working
 alone (also known as solo miners) don't stand a chance. The likelihood
 of them finding a block to offset their electricity and hardware costs
 is so low that it represents a gamble, like playing the lottery. Even
@@ -1461,7 +1461,7 @@ attack problem for Bitcoin itself. Rather, P2Pool makes Bitcoin more
 robust overall, as part of a diversified mining ecosystem.  As of this
 writing, P2Pool has fallen into disuse, but new protocols such as
 Stratum v2 can allow individual miners to choose the transactions they
-include in their((("bitcoins", "mining", "competitiveness of", startref="bitcoin-mining-competition")))((("mining", "competitiveness of", startref="mining-competitive"))) blocks.
+include in their((("bitcoins", "mining", "competitiveness of", startref="bitcoin-mining-competition")))((("mining", "competitiveness of", startref="mining-competitive")))((("bitcoins", "mining", "mining pools", startref="bitcoin-mining-pools")))((("mining", "mining pools", startref="mining-mining-pools")))((("mining pools", startref="mining-pools"))) blocks.
 
 [[consensus_attacks]]
 === Hashrate Attacks