diff --git a/ch01.asciidoc b/ch01.asciidoc
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+++ b/ch01.asciidoc
@@ -104,7 +104,7 @@ Web wallet:: Web wallets are accessed through a web browser and store the user's
 
 Hardware wallet:: Hardware wallets are devices that operate a secure self-contained bitcoin wallet on special-purpose hardware. They are operated via USB with a desktop web browser or via near-field-communication (NFC) on a mobile device. By handling all bitcoin-related operations on the specialized hardware, these wallets are considered very secure and suitable for storing large amounts of bitcoin.
 
-Paper wallet:: The keys controlling bitcoin can also be printed for long-term storage. These are known as paper wallets even though other materials (wood, metal, etc.) can be used. Paper wallets offer a low-tech but highly secure means of storing bitcoin long term. Offline storage is also often referred to as _cold storage_.
+((("cold storage", seealso="storage")))((("storage", "cold storage")))Paper wallet:: The keys controlling bitcoin can also be printed for long-term storage. These are known as paper wallets even though other materials (wood, metal, etc.) can be used. Paper wallets offer a low-tech but highly secure means of storing bitcoin long term. Offline storage is also often referred to as _cold storage_.
 
 Another way to categorize bitcoin wallets is by their degree of autonomy and how they interact with the bitcoin network: