diff --git a/configtest.py b/configtest.py
index a74956d..5b4775f 100644
--- a/configtest.py
+++ b/configtest.py
@@ -1,3 +1,9 @@
+#!/usr/bin/env python3
+"""
+configtest.py
+
+Tests the validity of your configuration in settings.py.
+"""
 import os
 import settings as settings
 
diff --git a/functions.py.default b/functions.py.default
index c13c25a..ebfb6db 100644
--- a/functions.py.default
+++ b/functions.py.default
@@ -1,3 +1,9 @@
+#!/usr/bin/env python3
+"""
+functions.py
+
+Functions used by imgupload which can be easily customized.
+"""
 import string
 import random
 
diff --git a/imgupload.py b/imgupload.py
index 345fe64..6728fc1 100644
--- a/imgupload.py
+++ b/imgupload.py
@@ -1,3 +1,9 @@
+#!/usr/bin/env python3
+"""
+imgupload.py
+
+Flask application for processing images uploaded through POST requests.
+"""
 from flask import Flask, request, jsonify, abort, Response
 from cryptography.fernet import Fernet
 from flask_api import status
diff --git a/settings.py.default b/settings.py.default
index 06bd33d..897214c 100644
--- a/settings.py.default
+++ b/settings.py.default
@@ -1,3 +1,10 @@
+#!/usr/bin/env python3
+"""
+settings.py
+
+User-defined settings used by imgupload.py.
+"""
+
 UPLOAD_FOLDER = "/path/to/images"
 ALLOWED_EXTENSIONS = [".png", ".jpg", ".jpeg", ".svg", ".bmp", ".gif", ".ico",  ".webp"]
 ROOTURL = "https://example.com/"