diff --git a/django_boost/templatetags/boost.py b/django_boost/templatetags/boost.py
index dad47d5..1fa4a94 100644
--- a/django_boost/templatetags/boost.py
+++ b/django_boost/templatetags/boost.py
@@ -1,3 +1,5 @@
+"""This module provides python build-in functions for django template."""
+
 from ast import literal_eval
 from itertools import chain, zip_longest
 from warnings import warn
diff --git a/django_boost/templatetags/boost_query.py b/django_boost/templatetags/boost_query.py
index 00eb624..8c12705 100644
--- a/django_boost/templatetags/boost_query.py
+++ b/django_boost/templatetags/boost_query.py
@@ -1,3 +1,5 @@
+"""This module provides queryset methods for django template."""
+
 from django import template
 
 register = template.Library()
diff --git a/django_boost/templatetags/boost_url.py b/django_boost/templatetags/boost_url.py
index f37f95f..68d4a76 100644
--- a/django_boost/templatetags/boost_url.py
+++ b/django_boost/templatetags/boost_url.py
@@ -1,3 +1,5 @@
+"""This module provides URL utility for django template."""
+
 from urllib import parse
 
 from django.template import Library
diff --git a/django_boost/templatetags/mimetype.py b/django_boost/templatetags/mimetype.py
index 4138f19..c3b4d2b 100644
--- a/django_boost/templatetags/mimetype.py
+++ b/django_boost/templatetags/mimetype.py
@@ -1,3 +1,5 @@
+"""This module provides mimetypes utility for django template."""
+
 from mimetypes import guess_type
 
 from django.template import Library