diff --git a/ch13_security.adoc b/ch13_security.adoc
index fdc0b3c4..973147d4 100644
--- a/ch13_security.adoc
+++ b/ch13_security.adoc
@@ -220,7 +220,7 @@ signing devices may become the predominant method of storing bitcoins.
 ==== Ensuring Your Access
 
 Although
-most users are rightly concerned about theft of their bitcoins, there is an even
+most users ((("backing up", "importance of")))are rightly concerned about theft of their bitcoins, there is an even
 bigger risk. Data files get lost all the time. If they contain Bitcoin keys,
 the loss is much more painful. In the effort to secure their Bitcoin
 wallets, users must be very careful not to go too far and end up losing
@@ -233,7 +233,7 @@ you secure your bitcoins too well you might not be able to find them again.
 
 [WARNING]
 ====
-To spend bitcoins, you may need to back up more than just your private
+To spend bitcoins, you may((("wallets", "recovery codes")))((("recovery codes"))) need to back up more than just your private
 keys or the BIP32 seed used to derive them.  This is especially the case
 when multisignatures or complex scripts are being used.  Most output
 scripts commit to the actual conditions that must be fulfilled to spend