diff --git a/ch07_authorization-authentication.adoc b/ch07_authorization-authentication.adoc
index 6373a64d..2e409ee9 100644
--- a/ch07_authorization-authentication.adoc
+++ b/ch07_authorization-authentication.adoc
@@ -274,7 +274,7 @@ OP_DUP OP_HASH160 <Key Hash> OP_EQUALVERIFY OP_CHECKSIG
 The +Key Hash+ is the data that would be encoded into a legacy base58check
 address.  Most applications would show the _public key hash_ in a script
 using hexadecimal encoding and not the familiar Bitcoin
-address base58check format that begins with a "1."
+address base58check format that begins with [.keep-together]#a "1."#
 
 The preceding output script can be satisfied with an input script
 of the form: