diff --git a/app/__main__.py b/app/__main__.py
index b4cd3a0..fec66e1 100644
--- a/app/__main__.py
+++ b/app/__main__.py
@@ -1,3 +1,4 @@
+"""The main entrypoint of the program."""
 import argparse
 import sys
 from parser import read_specs_file
@@ -5,55 +6,62 @@ from parser import read_specs_file
 
 # This just displays the error type and message, not the stack trace
 def except_hook(ext_type, value, traceback):
+    """
+    Make errors not show the stracktrace to stdout.
+
+    Todo:
+        * Replace this with proper error handling
+    """
     sys.stderr.write("{}: {}\n".format(ext_type.__name__, value))
 
 
 # sys.excepthook = except_hook
 
 
-# Define parser
-parser = argparse.ArgumentParser(
-    description="Backup directories and Docker volumes."
-)
-parser.add_argument(
-    "-f",
-    "--file",
-    action="append",
-    dest="file",
-    required=True,
-    help="File containing spec definitions.",
-)
-parser.add_argument(
-    "-j",
-    "--json",
-    action="store_const",
-    const=True,
-    default=False,
-    help="Print out the parsed specs as JSON and exit",
-)
-parser.add_argument(
-    "spec", nargs="*", help="The specs to process. Defaults to all."
-)
+if __name__ == "__main__":
+    # Define parser
+    parser = argparse.ArgumentParser(
+        description="Backup directories and Docker volumes."
+    )
+    parser.add_argument(
+        "-f",
+        "--file",
+        action="append",
+        dest="file",
+        required=True,
+        help="File containing spec definitions.",
+    )
+    parser.add_argument(
+        "-j",
+        "--json",
+        action="store_const",
+        const=True,
+        default=False,
+        help="Print out the parsed specs as JSON and exit",
+    )
+    parser.add_argument(
+        "spec", nargs="*", help="The specs to process. Defaults to all."
+    )
 
-# Parse arguments
-args = parser.parse_args()
-specs = sum([read_specs_file(path) for path in args.file], [])
+    # Parse arguments
+    args = parser.parse_args()
+    specs = sum((read_specs_file(path) for path in args.file), [])
 
-# Filter specs if needed
-if args.spec:
-    specs = list(filter(lambda s: s.name in args.spec, specs))
+    # Filter specs if needed
+    if args.spec:
+        specs = list(filter(lambda s: s.name in args.spec, specs))
 
-# Dump parsed data as json
-if args.json:
-    import json
+    # Dump parsed data as json
+    if args.json:
+        import json
 
-    print(json.dumps([spec.to_dict() for spec in specs], indent=4))
+        # TODO replace this with error handling system
+        print(json.dumps([spec.to_dict() for spec in specs], indent=4))
 
-else:
-    # Run the backups
-    if not specs:
-        print("No specs, exiting.")
-        sys.exit(0)
+    elif not specs:
+            # TODO replace this with error handling system
+            print("No specs, exiting.")
+            sys.exit(0)
 
-    for spec in specs:
-        spec.backup()
+        for spec in specs:
+            spec.backup()
diff --git a/app/specs/__init__.py b/app/specs/__init__.py
index 0192b9e..dd08c1c 100644
--- a/app/specs/__init__.py
+++ b/app/specs/__init__.py
@@ -1,4 +1,7 @@
+"""Parent module for the various spec types."""
 from .spec import Spec
 from .directory import DirectorySpec
 from .volume import VolumeSpec
 from .container import ContainerSpec
+
+__all__ = ["Spec", "DirectorySpec", "VolumeSpec", "ContainerSpec"]
diff --git a/app/specs/container.py b/app/specs/container.py
index bef6f8c..76579f0 100644
--- a/app/specs/container.py
+++ b/app/specs/container.py
@@ -1,3 +1,4 @@
+"""Module defining a Container-based spec."""
 from .spec import Spec
 from typing import Union
 from pathlib import Path
@@ -6,11 +7,10 @@ import subprocess
 
 
 class ContainerSpec(Spec):
-    """
-    A spec for backing up via a container.
-    """
+    """Spec for backing up via a container."""
 
     _SKEL = {"container": None, "command": None, "mountpoint": "/from"}
+    """The skeleton for the ContainerSpec config."""
 
     def __init__(
         self,
@@ -23,6 +23,22 @@ class ContainerSpec(Spec):
         mountpoint: str,
         notify=None,
     ):
+        """
+        Create a new ContainerSpec object.
+
+        Args:
+            name: name of the spec (used as an identifier)
+            container: the Docker container to back up
+            destination: where to store the backups (gets created if
+                non-existent)
+            limit: max amount of backups to keep
+            command: command to run inside the container. This command should
+                perform a specified backup and output this data to stdout. This
+                output then gets piped to a backup file.
+            extension: the extension of the backup files.
+            mountpoint:
+            notify: notifier object (may be None)
+        """
         super().__init__(name, destination, limit, extension, notify)
 
         self.container = container
diff --git a/app/specs/spec.py b/app/specs/spec.py
index 9b372ef..2669ccb 100644
--- a/app/specs/spec.py
+++ b/app/specs/spec.py
@@ -60,7 +60,19 @@ class Spec:
         self.extension = extension
 
     @classmethod
-    def skeleton(cls):
+    def skeleton(cls: "Spec") -> Dict:
+        """
+        Return the skeleton for the given class.
+
+        It works by inspecting the inheritance tree and merging the skeleton
+        for each of the parents.
+
+        Args:
+            cls: the class to get the skeleton for
+
+        Returns:
+            a dictionary containing the skeleton
+        """
         return skeleton.merge(
             *[val._SKEL for val in reversed(inspect.getmro(cls)[:-1])]
         )