diff --git a/ch04.asciidoc b/ch04.asciidoc
index b2e6f238..c2b692f2 100644
--- a/ch04.asciidoc
+++ b/ch04.asciidoc
@@ -29,7 +29,7 @@ When spending bitcoin, the current bitcoin owner presents her public key and a s
 
 [TIP]
 ====
-In most wallet implementations, the private and public keys are stored together as a _key pair_ for convenience. However, the public key can be calculated from the private key, so storing only the private key is also possible.
+((("keys and addresses", "overview of", "key pairs")))In most wallet implementations, the private and public keys are stored together as a _key pair_ for convenience. However, the public key can be calculated from the private key, so storing only the private key is also possible.
 ====
 
 [[private_public_keys]]