diff --git a/acme/acme/client.py b/acme/acme/client.py
index 776ddb38a..c3e28ef47 100644
--- a/acme/acme/client.py
+++ b/acme/acme/client.py
@@ -340,7 +340,7 @@ class Client(object):  # pylint: disable=too-many-instance-attributes
             `PollError` with non-empty ``waiting`` is raised.
 
         :returns: ``(cert, updated_authzrs)`` `tuple` where ``cert`` is
-            the issued certificate (`.messages.CertificateResource.),
+            the issued certificate (`.messages.CertificateResource`),
             and ``updated_authzrs`` is a `tuple` consisting of updated
             Authorization Resources (`.AuthorizationResource`) as
             present in the responses from server, and in the same order