Fix doctests.
diff --git a/docs/hazmat/primitives/cryptographic-hashes.rst b/docs/hazmat/primitives/cryptographic-hashes.rst
index b3db9f1..f05b45a 100644
--- a/docs/hazmat/primitives/cryptographic-hashes.rst
+++ b/docs/hazmat/primitives/cryptographic-hashes.rst
@@ -19,6 +19,7 @@
     various message digests.
 
     .. doctest::
+
         >>> from cryptography.hazmat.bindings import default_backend
         >>> from cryptography.hazmat.primitives import hashes
         >>> digest = hashes.Hash(hashes.SHA256(), default_backend())