diff --git a/ch13_security.adoc b/ch13_security.adoc
index 9fbe2b0a..fdc0b3c4 100644
--- a/ch13_security.adoc
+++ b/ch13_security.adoc
@@ -200,7 +200,7 @@ physically securing a printed copy of the key seed. A seed
 that is printed on paper is called a "paper backup," and
 many wallets can create them.
 Keeping bitcoins
-offline is called _cold storage_ and it is one of the most effective
+offline is ((("cold storage")))called _cold storage_ and it is one of the most effective
 security techniques. A cold storage system is one where the keys are
 generated on an offline system (one never connected to the internet) and
 stored offline either on paper or on digital media, such as a USB memory
@@ -208,7 +208,7 @@ stick.
 
 ==== Hardware Signing Devices
 
-In the long term, Bitcoin security may increasingly take the
+In the ((("hardware signing devices")))long term, Bitcoin security may increasingly take the
 form of tamper-proof hardware signing devices. Unlike a smartphone or desktop
 computer, a Bitcoin hardware signing device only needs to hold keys and
 use them to generate signatures.  Without general-purpose software to