diff --git a/synapse/federation/__init__.py b/synapse/federation/__init__.py
index b4d95ed5ac..ac0c10dc33 100644
--- a/synapse/federation/__init__.py
+++ b/synapse/federation/__init__.py
@@ -12,6 +12,7 @@
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
+
""" This package includes all the federation specific logic.
"""
diff --git a/synapse/federation/handler.py b/synapse/federation/handler.py
index 31e8470b33..d361f0aaf7 100644
--- a/synapse/federation/handler.py
+++ b/synapse/federation/handler.py
@@ -13,6 +13,7 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+
from twisted.internet import defer
from .pdu_codec import PduCodec
diff --git a/synapse/federation/pdu_codec.py b/synapse/federation/pdu_codec.py
index 9155930e47..adc166c564 100644
--- a/synapse/federation/pdu_codec.py
+++ b/synapse/federation/pdu_codec.py
@@ -12,6 +12,7 @@
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
+
from .units import Pdu
import copy
diff --git a/synapse/federation/persistence.py b/synapse/federation/persistence.py
index ad4111c683..372245712a 100644
--- a/synapse/federation/persistence.py
+++ b/synapse/federation/persistence.py
@@ -12,6 +12,7 @@
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
+
""" This module contains all the persistence actions done by the federation
package.
diff --git a/synapse/federation/replication.py b/synapse/federation/replication.py
index 0f5b974291..bea5335f89 100644
--- a/synapse/federation/replication.py
+++ b/synapse/federation/replication.py
@@ -12,6 +12,7 @@
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
+
"""This layer is responsible for replicating with remote home servers using
a given transport.
"""
diff --git a/synapse/federation/transport.py b/synapse/federation/transport.py
index 2136adf8d7..09a5e5901a 100644
--- a/synapse/federation/transport.py
+++ b/synapse/federation/transport.py
@@ -12,6 +12,7 @@
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
+
"""The transport layer is responsible for both sending transactions to remote
home servers and receiving a variety of requests from other home servers.
diff --git a/synapse/federation/units.py b/synapse/federation/units.py
index 0efea7b768..2b2f11f36a 100644
--- a/synapse/federation/units.py
+++ b/synapse/federation/units.py
@@ -12,6 +12,7 @@
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
+
""" Defines the JSON structure of the protocol units used by the server to
server protocol.
"""
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