Document the valueerror these might raise.
diff --git a/docs/hazmat/backends/interfaces.rst b/docs/hazmat/backends/interfaces.rst
index a32829f..769ab98 100644
--- a/docs/hazmat/backends/interfaces.rst
+++ b/docs/hazmat/backends/interfaces.rst
@@ -330,6 +330,10 @@
         :returns: A provider of
             :class:`~cryptography.hazmat.primitives.interfaces.RSAPrivateKey`.
 
+        :raises ValueError: This is raised when the values of ``p``, ``q``,
+            ``private_exponent``, ``public_exponent``, or ``modulus`` do not
+            match the bounds specified in :rfc:`3447`.
+
     .. method:: load_rsa_public_numbers(numbers):
 
         :param numbers: An instance of
@@ -338,6 +342,10 @@
         :returns: A provider of
             :class:`~cryptography.hazmat.primitives.interfaces.RSAPublicKey`.
 
+        :raises ValueError: This is raised when the values of
+            ``public_exponent`` or ``modulus`` do not match the bounds
+            specified in :rfc:`3447`.
+
 
 .. class:: TraditionalOpenSSLSerializationBackend