diff --git a/app/master_sound/api/resources/album_resource.py b/app/master_sound/api/resources/album_resource.py
index f055dfb..96dc377 100644
--- a/app/master_sound/api/resources/album_resource.py
+++ b/app/master_sound/api/resources/album_resource.py
@@ -20,6 +20,9 @@ def get(self):
             result['artists'] = [result['artists'][0]]
         return results, 200
 
+    # TODO:
+    # This method is large and hard to read
+    # Is possible use global try/catch
     def post(self):
         data = request.get_json()
         for _json in data:
diff --git a/app/master_sound/api/resources/song_resource.py b/app/master_sound/api/resources/song_resource.py
index 5ff761e..0fb01ec 100644
--- a/app/master_sound/api/resources/song_resource.py
+++ b/app/master_sound/api/resources/song_resource.py
@@ -25,6 +25,8 @@ def get(self, album_id):
         return results, 200
 
     def post(self):
+        # TODO:
+        # Data is unused
         data = request.get_json()
 
 
diff --git a/app/master_sound/models.py b/app/master_sound/models.py
index 39e95f8..0a63727 100644
--- a/app/master_sound/models.py
+++ b/app/master_sound/models.py
@@ -4,6 +4,11 @@
 
 from app.db import db, BaseModelMixin
 
+
+# TODO:
+# It's doesn't recommend handle migrations in the same file that the models
+# And the migrations should be handle with scripts
+
 albums_artists = db.Table(
         'albums_artists',
         db.Model.metadata,
diff --git a/app/spotify_api.py b/app/spotify_api.py
index f0d4c7d..2524fa6 100644
--- a/app/spotify_api.py
+++ b/app/spotify_api.py
@@ -7,6 +7,8 @@
 
 def get_token():
     BASE_TOKEN_URL = 'https://accounts.spotify.com/api/token'
+    # TODO:
+    # Put tokens in code it's bad practice
     CLIENT_ID = 'aba92b636b61480c992f35aa022405f7'
     CLIENT_SECRET = '1d4db40d8e304d43bce78d5bea3d9751'
     client_str = f'{CLIENT_ID}:{CLIENT_SECRET}'