diff --git a/API/Functions.py b/API/Functions.py
index 4858e26a571deb8d84f81efbeb0aeaebae4732ca..88ca32cdf02a8461b6e8f7cc76d7d5e28ab059f1 100644
--- a/API/Functions.py
+++ b/API/Functions.py
@@ -5,6 +5,7 @@ from dotenv import load_dotenv
 
 
 def safe_url(query):
+    """ convert query to URL-safe style """
     load_dotenv()
     host = os.getenv('SERVER_HOST')
     return host + Parser.url_safe(query)
@@ -24,6 +25,7 @@ def get(query):
 
 
 def put(query, json_file):
+    """ PUT request """
     print("PUT: " + query)
     url = safe_url(query)
     req = requests.put(url, json=json_file)
@@ -32,6 +34,7 @@ def put(query, json_file):
 
 
 def post(query, json_file):
+    """ POST request """
     print("POST: " + query)
     url = safe_url(query)
     req = requests.post(url, json=json_file)
@@ -40,6 +43,7 @@ def post(query, json_file):
 
 
 def delete(query):
+    """ DELETE request """
     print("DELETE: " + query)
     url = safe_url(query)
     req = requests.delete(url)
diff --git a/Crawler/Scrape.py b/Crawler/Scrape.py
index a2f97aefca3dde45cec48686887942fcfbc52771..bb0c4a9a300a56ed1cf6d781071880358016993c 100644
--- a/Crawler/Scrape.py
+++ b/Crawler/Scrape.py
@@ -4,6 +4,7 @@ from DataBase import mongoDB as db
 
 
 def scrape_api(url_api, book_num_api, author_num_api):
+    """ Function called by other module to run the scraper """
     print('Request received, start scraping')
     book_dict_api = {}
     author_dict_api = {}
diff --git a/DataBase/JsonParser.py b/DataBase/JsonParser.py
index 2a5e5247d8663b0d08c0a921c5b79317307d0e26..fa805723b49854ee50c49e375bcbdc2daa4a0c5d 100644
--- a/DataBase/JsonParser.py
+++ b/DataBase/JsonParser.py
@@ -1,5 +1,6 @@
 
 def parse_book_dict_to_json(dictionary):
+    """ parse books dictionary to json file """
     item_list = list(dictionary.items())
     return_list = []
     for items in item_list: