diff --git a/polls/admin.py b/polls/admin.py
index f7f2a32..c2ce0aa 100644
--- a/polls/admin.py
+++ b/polls/admin.py
@@ -19,4 +19,5 @@ class QuestionAdmin(admin.ModelAdmin):
     search_fields = ["question_text"]
 
 
-admin.site.register(Question, QuestionAdmin)
\ No newline at end of file
+admin.site.register(Question, QuestionAdmin)
+    
\ No newline at end of file
diff --git a/polls/apps.py b/polls/apps.py
index 5a5f94c..1dffd05 100644
--- a/polls/apps.py
+++ b/polls/apps.py
@@ -4,3 +4,4 @@ from django.apps import AppConfig
 class PollsConfig(AppConfig):
     default_auto_field = 'django.db.models.BigAutoField'
     name = 'polls'
+    
\ No newline at end of file
diff --git a/polls/models.py b/polls/models.py
index 1528cf3..7252b32 100644
--- a/polls/models.py
+++ b/polls/models.py
@@ -1,3 +1,14 @@
+"""
+This module defines the models for the polls app.
+
+It includes the Question and Choice models, which represent poll questions
+and the choices associated with them. These models are used to store and
+get poll data in the database.
+
+Attributes:
+    None
+"""
+
 import datetime
 
 from django.db import models
@@ -6,10 +17,24 @@ from django.contrib import admin
 
 
 class Question(models.Model):
+    """
+    Represents a poll question.
+
+    Attributes:
+        question_text (str): The text of the poll question.
+        pub_date (datetime): The date and time when the question was published.
+    """
+
     question_text = models.CharField(max_length=200)
     pub_date = models.DateTimeField("date published")
 
     def was_published_recently(self):
+        """
+        Checks if the question was published recently or not.
+
+        Returns:
+            bool: True if the question was published within the last day, else False.
+        """
         now = timezone.now()
         return now - datetime.timedelta(days=1) <= self.pub_date <= now
 
@@ -23,13 +48,29 @@ class Question(models.Model):
         return now - datetime.timedelta(days=1) <= self.pub_date <= now
 
     def __str__(self):
+        """
+        Returns a string representation of the question.
+        """
         return self.question_text
 
 
 class Choice(models.Model):
+    """
+    Represents a choice for a poll question.
+
+    Attributes:
+        question (Question): The poll question to which the choice belongs.
+        choice_text (str): The text of the choice.
+        votes (int): The number of votes the choice has received.
+    """
+
     question = models.ForeignKey(Question, on_delete=models.CASCADE)
     choice_text = models.CharField(max_length=200)
     votes = models.IntegerField(default=0)
 
     def __str__(self):
-        return self.choice_text
\ No newline at end of file
+        """
+        Returns a string representation of the choice.
+        """
+        return self.choice_text
+    
\ No newline at end of file
diff --git a/polls/tests.py b/polls/tests.py
index 17d37ca..410f88f 100644
--- a/polls/tests.py
+++ b/polls/tests.py
@@ -126,3 +126,4 @@ class QuestionDetailViewTests(TestCase):
         url = reverse("polls:detail", args=(past_question.id,))
         response = self.client.get(url)
         self.assertContains(response, past_question.question_text)
+    
\ No newline at end of file
diff --git a/polls/urls.py b/polls/urls.py
index 45ebddd..6d2b663 100644
--- a/polls/urls.py
+++ b/polls/urls.py
@@ -9,3 +9,4 @@ urlpatterns = [
     path("<int:pk>/results/", views.ResultsView.as_view(), name="results"),
     path("<int:question_id>/vote/", views.vote, name="vote"),
 ]
+    
\ No newline at end of file
diff --git a/polls/views.py b/polls/views.py
index 320229c..6180804 100644
--- a/polls/views.py
+++ b/polls/views.py
@@ -9,6 +9,10 @@ from .models import Choice, Question
 
 
 class HomeView(TemplateView):
+    """
+    Provide a view for Home page(first page).
+    """
+
     template_name = 'polls/home.html'
 
     def get_context_data(self, **kwargs):
@@ -19,6 +23,10 @@ class HomeView(TemplateView):
 
 
 class IndexView(generic.ListView):
+    """
+    Provide a view for Index page that list all polls.
+    """
+
     template_name = "polls/index.html"
     context_object_name = "latest_question_list"
 
@@ -33,6 +41,11 @@ class IndexView(generic.ListView):
 
 
 class DetailView(generic.DetailView):
+    """
+    Provide a view for detail page, a detail for each poll contain poll question
+    and poll choices.
+    """
+
     model = Question
     template_name = "polls/detail.html"
 
@@ -42,12 +55,22 @@ class DetailView(generic.DetailView):
         """
         return Question.objects.filter(pub_date__lte=timezone.now())
 
+
 class ResultsView(generic.DetailView):
+    """
+    Provide a view for result page that show up when user submit on of the choices.
+    """
+
     model = Question
     template_name = "polls/results.html"
 
 
 def vote(request, question_id):
+    """
+    A function that update the database. Add vote count to choice that user vote
+    in specific question_id.
+    """
+
     question = get_object_or_404(Question, pk=question_id)
     try:
         selected_choice = question.choice_set.get(pk=request.POST["choice"])
@@ -63,4 +86,5 @@ def vote(request, question_id):
     else:
         selected_choice.votes += 1
         selected_choice.save()
-        return HttpResponseRedirect(reverse("polls:results", args=(question.id,)))
\ No newline at end of file
+        return HttpResponseRedirect(reverse("polls:results", args=(question.id,)))
+    
\ No newline at end of file