diff --git a/docs/specs/certificate-format.rst b/docs/specs/certificate-format.rst
index 9db67b3..d009985 100644
--- a/docs/specs/certificate-format.rst
+++ b/docs/specs/certificate-format.rst
@@ -1,3 +1,5 @@
+.. _NDN Certificate Format Version 2.0:
+
 NDN Certificate Format Version 2.0
 ==================================
 
diff --git a/docs/specs/signed-interest.rst b/docs/specs/signed-interest.rst
index 093797a..2319e5a 100644
--- a/docs/specs/signed-interest.rst
+++ b/docs/specs/signed-interest.rst
@@ -1,3 +1,5 @@
+.. _Signed Interest:
+
 Signed Interest
 ===============