diff --git a/book/source/08-signing_components.md b/book/source/08-signing_components.md
index 8a9f3f1..0b899c8 100644
--- a/book/source/08-signing_components.md
+++ b/book/source/08-signing_components.md
@@ -135,6 +135,7 @@ The additional [*primary key binding*](https://www.ietf.org/archive/id/draft-iet
 
 The *primary key binding signature* is "embedded" as subpacket data in the *subkey binding signature* which connects the signing subkey to the primary key.
 
+(bind_ident)=
 ### Binding identities to a certificate
 
 Another use-case for a self-signature is to link an identity component (such as a User ID that specifies a name and email address) to a certificate.