diff --git a/appb_errata.adoc b/appb_errata.adoc
index 8c071f96..f11b1b0b 100644
--- a/appb_errata.adoc
+++ b/appb_errata.adoc
@@ -203,7 +203,7 @@ it has been in use since 2015.
 === Calculations
 
 ____
-"The receiver generates a new key pair and gives the public key to the
+"The receiver ((("calculations", "errata in Bitcoin whitepaper")))generates a new key pair and gives the public key to the
 sender shortly before signing. This prevents the sender from preparing a
 chain of blocks ahead of time by working on it continuously until he is
 lucky enough to get far enough ahead, then executing the transaction at