diff --git a/app/server.py b/app/server.py
index 8da4bd2..cc2645f 100644
--- a/app/server.py
+++ b/app/server.py
@@ -1,7 +1,8 @@
-from app.tools.tools import *
-from app.tools.caching import *
 from flask import Flask, make_response
 
+from app.tools.caching import *
+from app.tools.tools import *
+
 app = Flask(__name__)
 
 
@@ -25,4 +26,4 @@ def main(calendar):
 #   Maybe try with https://docs.python.org/3/library/sched.html
 thread = CacheThread()
 thread.start()
-app.run(host='0.0.0.0', port=8088)
\ No newline at end of file
+app.run(host='0.0.0.0', port=8088)
diff --git a/app/tools/caching.py b/app/tools/caching.py
index 776797a..c08f5c5 100644
--- a/app/tools/caching.py
+++ b/app/tools/caching.py
@@ -10,6 +10,17 @@ from ics import Calendar
 
 
 def cache(entry: dict) -> None:
+    """Cache an .ics feed in the app/cache directory.
+    Different entries with the same URL will be cached in the same file.
+    The cached calendar contains a new line in the description with the current time when cached prefixed by the
+    'Cached at' mention
+
+
+    :param entry: representation of the entry to cache.  This is the Python representation of the corresponding entry
+    in the config file
+    :type entry: dict
+    """
+
     if not os.path.isdir('cache'):
         os.mkdir('cache')
 
@@ -27,6 +38,21 @@ def cache(entry: dict) -> None:
 
 
 def get_from_cache(entry: dict) -> Calendar:
+    """Retrieve the entry from cache.  If the entry is not found, an exception is raised
+
+
+    :param entry: representation of the entry to cache.  This is the Python representation of the corresponding entry
+    in the config file
+    :type entry: dict
+
+
+    :return: the corresponding calendar in cache
+    :rtype: Calendar
+
+
+    :raises FileNotfoundError: if the entry has not been cached before
+    """
+
     url = entry['url']
     path = "cache/" + sha256(url.encode()).hexdigest() + ".ics"
     if not os.path.isfile(path):
@@ -40,6 +66,22 @@ def get_from_cache(entry: dict) -> Calendar:
 
 
 def load_cal(entry: dict) -> Calendar:
+    """Load the calendar from the cache or from remote according to the entry.  If the calendar is supposed to be in
+    cached but could not be found in cache, an error is thrown
+
+
+    :param entry: representation of the entry to cache.  This is the Python representation of the corresponding entry
+    in the config file
+    :type entry: dict
+
+
+    :return: the calendar corresponding to the entry
+    :rtype: Calendar
+
+
+    :raises FileNotfoundError: if the entry was supposed to be cached but has not been cached before
+    """
+
     if "cache" in entry and entry["cache"]:
         print("Getting", entry["name"], "from cache")
         return get_from_cache(entry)
@@ -57,6 +99,21 @@ def load_cal(entry: dict) -> Calendar:
 
 
 def horodate(cal: Calendar, prefix='') -> Calendar:
+    """Add a new line at the end of the description of every event in the calendar with the current time prefixed by
+    the prefix parameter and a space
+    The date is added with the following format: YYYY-MM-DD HH:mm:ss
+
+
+    :param cal: calendar to process
+    :type cal: Calendar
+
+    :param prefix: the prefix to add in front of the date
+    :type prefix: str
+
+
+    :return: the modified calendar
+    :rtype: Calendar
+    """
     now = arrow.now().format("YYYY-MM-DD HH:mm:ss")
     for event in cal.events:
         event.description = event.description + '\n' + prefix + ' ' + now \
@@ -66,6 +123,9 @@ def horodate(cal: Calendar, prefix='') -> Calendar:
 
 
 def background_cache() -> None:
+    """Start the caching of every config file found in the app/config directory
+    """
+
     path = "app/config"
     files = [os.path.join(path, f) for f in os.listdir(path)
              if os.path.isfile(os.path.join(path, f)) and f.endswith('.json')]
@@ -84,6 +144,8 @@ def background_cache() -> None:
 
 
 class CacheThread(threading.Thread):
+    """Child class of the threading.Thread class to run the caching process every 10 minutes
+    """
     def __init__(self):
         threading.Thread.__init__(self)