Add wikipedia link to ANSI X.923
diff --git a/docs/hazmat/primitives/padding.rst b/docs/hazmat/primitives/padding.rst
index 37e4252..475976a 100644
--- a/docs/hazmat/primitives/padding.rst
+++ b/docs/hazmat/primitives/padding.rst
@@ -56,10 +56,10 @@
.. class:: ANSIX923(block_size)
- ANSI X.923 padding works by appending ``N-1`` bytes with the value of ``0``
- and a last byte with the value of ``chr(N)``, where ``N`` is the number of
- bytes required to make the final block of data the same size as the block
- size. A simple example of padding is:
+ `ANSI X.923`_ padding works by appending ``N-1`` bytes with the value of
+ ``0`` and a last byte with the value of ``chr(N)``, where ``N`` is the
+ number of bytes required to make the final block of data the same size as
+ the block size. A simple example of padding is:
.. doctest::
@@ -123,3 +123,5 @@
:raises TypeError: Raised if data is not bytes.
:raises ValueError: When trying to remove padding from incorrectly
padded data.
+
+.. _`ANSI X.923`: https://en.wikipedia.org/wiki/Padding_%28cryptography%29#ANSI_X.923