diff --git a/solvable/src/pipe_io_auxlib.py b/solvable/src/pipe_io_auxlib.py
index 37bb1a8..75c831e 100644
--- a/solvable/src/pipe_io_auxlib.py
+++ b/solvable/src/pipe_io_auxlib.py
@@ -1,9 +1,67 @@
 from json import dumps, loads
+
 from tfw.crypto import KeyManager, sign_message, verify_message
 from tfw.components import PipeIOEventHandlerBase
 from tfw.components.pipe_io_event_handler import DEFAULT_PERMISSIONS
 
+
+class SignMessagePipeIOEventHandler(PipeIOEventHandlerBase):
+    """
+    Signs a valid TFW message with HMAC.
+    Note that the running process needs root permissions in order to read
+    the authentication key.
+    When forwarding is true, it will send the signed message to the TFW
+    server before writing it into the output pipe.
+    """
+    
+    def __init__(
+            self, in_pipe_path, out_pipe_path,
+            permissions=DEFAULT_PERMISSIONS,
+            forwarding=True
+    ):
+        self.forwarding = forwarding
+        self.auth_key = KeyManager().auth_key
+        super().__init__(None, in_pipe_path, out_pipe_path, permissions)
+
+    def handle_event(self, message):
+        return
+
+    def handle_pipe_event(self, message_bytes):
+        message = loads(message_bytes)
+        sign_message(self.auth_key, message)
+        if self.forwarding:
+            self.server_connector.send(message)
+        self.pipe_io.send_message(dumps(message).encode())
+
+
+class VerifyMessagePipeIOEventHandler(PipeIOEventHandlerBase):
+    """
+    Verifies a signed TFW message.
+    This pipe also needs root permissions. Send the serialized JSON object
+    to the pipe, then wait for its boolean response.
+    """
+
+    def __init__(self, in_pipe_path, out_pipe_path, permissions=DEFAULT_PERMISSIONS):
+        self.auth_key = KeyManager().auth_key
+        super().__init__(None, in_pipe_path, out_pipe_path, permissions)
+
+    def handle_event(self, message):
+        return
+
+    def handle_pipe_event(self, message_bytes):
+        message = loads(message_bytes)
+        validity = verify_message(self.auth_key, message)
+        self.pipe_io.send_message(str(validity).lower().encode())
+
+
 class DeployPipeIOEventHandler(PipeIOEventHandlerBase):
+    """
+    Manages deployment in the IDE.
+    When you receive "deploy", then you have to answer with a "true" or
+    "false" depending whether you are satisfied with the result or not.
+    The @process parameter is the name of the supervised service.
+    """
+
     # pylint: disable=too-many-arguments
     def __init__(
             self, in_pipe_path, out_pipe_path, process,
@@ -50,7 +108,18 @@ class DeployPipeIOEventHandler(PipeIOEventHandlerBase):
                 f'{self.pipe_io.in_pipe}: Expected "true" or "false".'
             )
 
+
 class IdePipeIOEventHandler(PipeIOEventHandlerBase):
+    """
+    Manipulates the content of the IDE.
+    You can observe a file, and when the user edits it, you will receive
+    the new contents where newlines are escaped as "\\n".
+    In order to overwrite the file, send an escaped text back to the pipe.
+    Since the pipe doesn't know if the file is selected initially in the IDE,
+    you have to provide this information by yourself with @selected,
+    but it will track it later on.
+    """
+
     # pylint: disable=too-many-arguments
     def __init__(
             self, in_pipe_path, out_pipe_path, filename,
@@ -103,7 +172,15 @@ class IdePipeIOEventHandler(PipeIOEventHandlerBase):
             }
         })
 
+
 class FSMPipeIOEventHandler(PipeIOEventHandlerBase):
+    """
+    Handles FSM steps.
+    When the FSM enters the next state, you will receive a line containing
+    its name. To trigger a state change, send the name of the transition to
+    the pipe.
+    """
+
     def __init__(self, in_pipe_path, out_pipe_path, permissions=DEFAULT_PERMISSIONS):
         super().__init__(
             ['fsm', 'fsm_update'],
@@ -119,36 +196,3 @@ class FSMPipeIOEventHandler(PipeIOEventHandlerBase):
             'key': '',
             'trigger': message_bytes.decode()
         })
-
-class MsgSignPipeIOEventHandler(PipeIOEventHandlerBase):
-    def __init__(
-            self, in_pipe_path, out_pipe_path,
-            permissions=DEFAULT_PERMISSIONS,
-            forwarding=True
-    ):
-        self.forwarding = forwarding
-        self.auth_key = KeyManager().auth_key
-        super().__init__(None, in_pipe_path, out_pipe_path, permissions)
-
-    def handle_event(self, message):
-        return
-
-    def handle_pipe_event(self, message_bytes):
-        message = loads(message_bytes)
-        sign_message(self.auth_key, message)
-        if self.forwarding:
-            self.server_connector.send(message)
-        self.pipe_io.send_message(dumps(message).encode())
-
-class MsgVerifyPipeIOEventHandler(PipeIOEventHandlerBase):
-    def __init__(self, in_pipe_path, out_pipe_path, permissions=DEFAULT_PERMISSIONS):
-        self.auth_key = KeyManager().auth_key
-        super().__init__(None, in_pipe_path, out_pipe_path, permissions)
-
-    def handle_event(self, message):
-        return
-
-    def handle_pipe_event(self, message_bytes):
-        message = loads(message_bytes)
-        validity = verify_message(self.auth_key, message)
-        self.pipe_io.send_message(str(validity).lower().encode())
diff --git a/solvable/src/pipe_io_main.py b/solvable/src/pipe_io_main.py
index bef89a9..61fb547 100644
--- a/solvable/src/pipe_io_main.py
+++ b/solvable/src/pipe_io_main.py
@@ -31,50 +31,23 @@ if __name__ == '__main__':
         permissions=0o666
     )
 
-    '''
-    Signs a valid TFW message with HMAC.
-    Note that this process needs root permissions in order to read the
-    authentication key.
-    When forwarding is true, it will send the signed message to the TFW
-    server before writing it into the output pipe.
-    '''
     sign_pipe = MsgSignPipeIOEventHandler(
         '/tmp/tfw_sign_send',
         '/tmp/tfw_sign_recv',
         forwarding=True
     )
 
-    '''
-    Verifies a signed TFW message.
-    This pipe also needs root permissions. Send the serialized JSON object
-    to the pipe, then wait for its boolean response.
-    '''
     verify_pipe = MsgVerifyPipeIOEventHandler(
         '/tmp/tfw_verify_send',
         '/tmp/tfw_verify_recv'
     )
 
-    '''
-    Manages deployment in the IDE.
-    When you receive "deploy", then you have to answer with a "true" or
-    "false" depending whether you are satisfied with the result or not.
-    The third parameter is the name of the supervised service.
-    '''
     deploy_pipe = DeployPipeIOEventHandler(
         '/tmp/tfw_deploy_send',
         '/tmp/tfw_deploy_recv',
         'webservice'
     )
 
-    '''
-    Manipulates the content of the IDE.
-    You can observe a file, and when the user edits it, you will receive
-    the new contents where newlines are escaped as "\\n".
-    In order to overwrite the file, send an escaped text back to the pipe.
-    Since the pipe doesn't know if the file is selected initially in the IDE,
-    you have to provide this information by yourself, but it will track it
-    later on.
-    '''
     ide_pipe = IdePipeIOEventHandler(
         '/tmp/tfw_ide_send',
         '/tmp/tfw_ide_recv',
@@ -82,12 +55,6 @@ if __name__ == '__main__':
         selected=True
     )
 
-    '''
-    Handles FSM steps.
-    When the FSM enters the next state, you will receive a line containing
-    its name.
-    To trigger a state change, send the name of the transition to the pipe.
-    '''
     fsm_pipe = FSMPipeIOEventHandler(
         '/tmp/tfw_fsm_send',
         '/tmp/tfw_fsm_recv'