diff --git a/letsencrypt/client/network2.py b/letsencrypt/client/network2.py
index 758c48229..7e45c3b59 100644
--- a/letsencrypt/client/network2.py
+++ b/letsencrypt/client/network2.py
@@ -27,6 +27,7 @@ class Network(object):
         self.alg = alg
 
     def _wrap_in_jws(self, data):
+        """Wrap `JSONDeSerializable` object in JWS."""
         dumps = data.json_dumps()
         logging.debug('Serialized JSON: %s', dumps)
         return jose.JWS.sign(