Mention both RFCs
diff --git a/docs/hazmat/primitives/asymmetric/serialization.rst b/docs/hazmat/primitives/asymmetric/serialization.rst
index 2a70146..739bfb8 100644
--- a/docs/hazmat/primitives/asymmetric/serialization.rst
+++ b/docs/hazmat/primitives/asymmetric/serialization.rst
@@ -29,10 +29,10 @@
~~~~~~~~~~~~~~
PKCS #8 is a serialization format originally standardized by RSA and currently
-maintained by the IETF in :rfc:`5208`. It supports password based encryption
-and additional key metadata attributes. These keys are recognizable because
-they all begin with ``-----BEGIN PRIVATE KEY-----`` or with ``-----BEGIN
-ENCRYPTED PRIVATE KEY-----`` if they have a password.
+maintained by the IETF in :rfc:`5208` and :rfc:`5958`. It supports password
+based encryption and additional key metadata attributes. These keys are
+recognizable because they all begin with ``-----BEGIN PRIVATE KEY-----`` or
+with ``-----BEGIN ENCRYPTED PRIVATE KEY-----`` if they have a password.
.. function:: load_pkcs8_private_key(data, password, backend)