diff --git a/docs/development/test-vectors.rst b/docs/development/test-vectors.rst
index 69f54d3..eb4247b 100644
--- a/docs/development/test-vectors.rst
+++ b/docs/development/test-vectors.rst
@@ -145,6 +145,8 @@
   ``uniformResourceIdentifier`` general names with IDNA (:rfc:`5895`) encoding.
 * ``san_rfc822_names.pem`` - An RSA 2048 bit self-signed certificate containing
   a subject alternative name extension with various ``rfc822Name`` values.
+* ``san_rfc822_idna.pem`` - An RSA 2048 bit self-signed certificate containing
+  a subject alternative name extension with an IDNA ``rfc822Name``.
 * ``san_uri_with_port.pem`` - An RSA 2048 bit self-signed certificate
   containing a subject alternative name extension with various
   ``uniformResourceIdentifier`` values.
diff --git a/vectors/cryptography_vectors/x509/custom/san_rfc822_idna.pem b/vectors/cryptography_vectors/x509/custom/san_rfc822_idna.pem
new file mode 100644
index 0000000..f7582e9
--- /dev/null
+++ b/vectors/cryptography_vectors/x509/custom/san_rfc822_idna.pem
@@ -0,0 +1,18 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----