diff --git a/src/class_objectProcessor.py b/src/class_objectProcessor.py
index 2c741661..1a2f7751 100644
--- a/src/class_objectProcessor.py
+++ b/src/class_objectProcessor.py
@@ -149,11 +149,13 @@ class objectProcessor(threading.Thread):
                 'ackreceived', int(time.time()), data[readPosition:])
             queues.UISignalQueue.put((
                 'updateSentItemStatusByAckdata',
-                (data[readPosition:],
-                 tr._translate(
-                     "MainWindow",
-                     "Acknowledgement of the message received %1"
-                 ).arg(l10n.formatTimestamp()))
+                (
+                    data[readPosition:],
+                    tr._translate(
+                        "MainWindow",
+                        "Acknowledgement of the message received %1"
+                    ).arg(l10n.formatTimestamp())
+                )
             ))
         else:
             logger.debug('This object is not an acknowledgement bound for me.')
diff --git a/src/class_smtpDeliver.py b/src/class_smtpDeliver.py
index 58cd4631..14df14c9 100644
--- a/src/class_smtpDeliver.py
+++ b/src/class_smtpDeliver.py
@@ -1,6 +1,5 @@
 """
-src/class_smtpDeliver.py
-========================
+SMTP client thread for delivering emails
 """
 # pylint: disable=unused-variable
 
diff --git a/src/helper_sent.py b/src/helper_sent.py
index 5a345fe7..bc3362e8 100644
--- a/src/helper_sent.py
+++ b/src/helper_sent.py
@@ -2,7 +2,8 @@
 Insert values into sent table
 """
 
-from helper_sql import *
+from helper_sql import sqlExecute
+
 
 def insert(t):
     """Perform an insert into the `sent` table"""
diff --git a/src/multiqueue.py b/src/multiqueue.py
index 8c64d33d..d7c10847 100644
--- a/src/multiqueue.py
+++ b/src/multiqueue.py
@@ -1,6 +1,6 @@
 """
-src/multiqueue.py
-=================
+A queue with multiple internal subqueues.
+Elements are added into a random subqueue, and retrieval rotates
 """
 
 import Queue
diff --git a/src/proofofwork.py b/src/proofofwork.py
index bb16951c..e43e0f02 100644
--- a/src/proofofwork.py
+++ b/src/proofofwork.py
@@ -1,7 +1,6 @@
 # pylint: disable=too-many-branches,too-many-statements,protected-access
 """
-src/proofofwork.py
-==================
+Proof of work calculation
 """
 
 import ctypes