diff --git a/appb_errata.adoc b/appb_errata.adoc
index ef419e8c..a0e76f4e 100644
--- a/appb_errata.adoc
+++ b/appb_errata.adoc
@@ -168,7 +168,7 @@ nodes will need to process all transactions.
 === Simplified Payment Verification
 
 ____
-"One strategy to protect against this would be to accept alerts from
+"One strategy((("payment verification", "errata in Bitcoin whitepaper")))((("verifying payment", "errata in Bitcoin whitepaper"))) to protect against this would be to accept alerts from
 network nodes when they detect an invalid block, prompting the user’s
 software to download the full block and alerted transactions to confirm
 the inconsistency."