diff --git a/tmdb.py b/tmdb.py
index 9c14de8..39686f2 100644
--- a/tmdb.py
+++ b/tmdb.py
@@ -10,6 +10,7 @@ class Tmdb:
         self.apikey = apikey
         self.language = language
 
+    # fetches data from TMDB API
     def fetch_from_tmdb(self, path, parameters):
         apikey = "?api_key=%s" % self.apikey
         url = self.baseurl + path + apikey + parameters
@@ -17,6 +18,7 @@ class Tmdb:
         data = json.loads(json_url.read())
         return data
 
+    # finds TMDB-id for a known IMDB-id, return 0 if nothing is found
     def get_tmdbid(self, imdbid):
         print("getting tmdbid for imdbid %s" % imdbid)
         data = self.fetch_from_tmdb(
@@ -31,6 +33,8 @@ class Tmdb:
             print("tmdbid could not be found")
         return tmdbid
 
+    # get recommendations for a movie id
+    # choice is either "recommendations" or "similar"
     def get_recommendations(self, movieid, choice):
         print("getting %s for %d" % (choice, movieid))
         data = self.fetch_from_tmdb(
@@ -39,9 +43,13 @@ class Tmdb:
         )
         results = []
         for result in data['results']:
-            results.append({'title': result['title'], 'movieid': result['id']})
+            results.append({
+                'title': result['title'],
+                'movieid': result['id']
+            })
         return results
 
+    # get trailers, teasers, clips... for a movie id
     def get_movie_trailers(self, movieid):
         print("getting trailers for %d" % movieid)
         data = self.fetch_from_tmdb(
@@ -53,22 +61,32 @@ class Tmdb:
             if result['site'] == 'YouTube':
                 location = 'plugin://plugin.video.youtube/play/?video_id=%s' % result['key']
             else:
+                # skip other sites
                 next
-            results.append({'title': result['name'], 'type': result['type'], 'location': location})
+            results.append({
+                'title': result['name'],
+                'type': result['type'],
+                'location': location
+            })
         return results
 
+    # get a number of trailers of a certain kind for a list of recommended movies
     def get_trailers(self, recommendations, cliptype, count):
         results = []
+        # loop over list of recommendations
         for recommendation in recommendations[:10]:
             all_trailers = self.get_movie_trailers(recommendation['movieid'])
+            # filter to get only a certain kind of trailer
             trailers = []
             for trailer in all_trailers:
                 if trailer['type'] == cliptype:
                     trailers.append(trailer)
+            # get a random clip for this recommendation
             if len(trailers) > 0:
                 random.shuffle(trailers)
                 trailer = trailers[0]
                 results.append(trailer)
+            # quit if enough clips have been collected
             if len(results) == count:
                 break
         return results