pbkdf2 docs
diff --git a/docs/hazmat/backends/interfaces.rst b/docs/hazmat/backends/interfaces.rst
index fa4f800..14ca688 100644
--- a/docs/hazmat/backends/interfaces.rst
+++ b/docs/hazmat/backends/interfaces.rst
@@ -159,7 +159,7 @@
:param int length: The desired length of the derived key. Maximum is
2\ :sup:`31` - 1.
- :param bytes salt: A salt. `RFC 2898`_ recommends 64-bits or longer.
+ :param bytes salt: A salt.
:param int iterations: The number of iterations to perform of the hash
function.
@@ -169,4 +169,3 @@
:return bytes: Derived key.
-.. _`RFC 2898`: https://www.ietf.org/rfc/rfc2898.txt