diff --git a/ch07_authorization-authentication.adoc b/ch07_authorization-authentication.adoc
index 14fa276e..701892d0 100644
--- a/ch07_authorization-authentication.adoc
+++ b/ch07_authorization-authentication.adoc
@@ -1725,7 +1725,7 @@ in the((("scripts", "MAST", startref="script-mast")))((("MAST (merklized alterna
 [[pay_to_contract]]
 === Pay to Contract (P2C)
 
-As we saw in <<public_child_key_derivation>>, the math of elliptic curve
+As we((("P2C (pay to contract)", id="p2c")))((("key tweaks", id="key-tweak")))((("public key cryptography", "key tweaks", id="pub-key-tweak"))) saw in <<public_child_key_derivation>>, the math of elliptic curve
 cryptography (ECC) allows Alice to use a private key to derive a public
 key that she gives to Bob.  He can add an arbitrary value to that public
 key to create a derived public key.  If he gives that arbitrary value to Alice, she can
@@ -1762,7 +1762,7 @@ privacy loss.
 Because P2C is private by default, we can't know how often it is used
 for its original purpose--in theory every payment could be using it,
 although we consider that unlikely.  However, P2C is widely used today
-in a slightly different form, which we'll see in <<taproot>>.
+in a slightly different form, which we'll((("P2C (pay to contract)", startref="p2c")))((("key tweaks", startref="key-tweak")))((("public key cryptography", "key tweaks", startref="pub-key-tweak"))) see in <<taproot>>.
 
 [[scriptless_multisignatures_and_threshold_signatures]]
 === Scriptless Multisignatures and Threshold Signatures