diff --git a/boards/models/post.py b/boards/models/post.py
--- a/boards/models/post.py
+++ b/boards/models/post.py
@@ -57,6 +57,10 @@ class PostManager(models.Manager):
 
     def create_post(self, title, text, image=None, thread=None,
                     ip=NO_IP, tags=None, user=None):
+        """
+        Create new post
+        """
+
         self.clear_ppd_cache_if_old()
 
         posting_time = timezone.now()
@@ -95,6 +99,10 @@ class PostManager(models.Manager):
         return post
 
     def delete_post(self, post):
+        """
+        Delete post and update its thread
+        """
+
         thread = post.thread_new
         thread.last_edit_time = timezone.now()
         thread.save()
@@ -102,6 +110,10 @@ class PostManager(models.Manager):
         post.delete()
 
     def delete_posts_by_ip(self, ip):
+        """
+        Delete all posts of the author with same IP
+        """
+
         posts = self.filter(poster_ip=ip)
         map(self.delete_post, posts)
 
@@ -159,7 +171,9 @@ class PostManager(models.Manager):
             map(Thread.delete_with_posts, old_threads)
 
     def connect_replies(self, post):
-        """Connect replies to a post to show them as a refmap"""
+        """
+        Connect replies to a post to show them as a reflink map
+        """
 
         for reply_number in re.finditer(REGEX_REPLY, post.text.raw):
             post_id = reply_number.group(1)
@@ -171,10 +185,16 @@ class PostManager(models.Manager):
                 referenced_post.save()
 
     def _get_page_count(self, thread_count):
+        """
+        Get number of pages that will be needed for all threads
+        """
+
         return int(math.ceil(thread_count / float(settings.THREADS_PER_PAGE)))
 
     def get_posts_per_day(self):
-        """Get average count of posts per day for the last 7 days"""
+        """
+        Get average count of posts per day for the last 7 days
+        """
 
         ppd = cache.get(CACHE_KEY_PPD)
         if ppd:
@@ -210,6 +230,7 @@ class Post(models.Model):
     class Meta:
         app_label = APP_LABEL_BOARDS
 
+    # TODO Save original file name to some field
     def _update_image_filename(self, filename):
         """Get unique image filename"""
 
@@ -279,12 +300,16 @@ class Thread(models.Model):
                                      blank=True, related_name='tre+')
 
     def get_tags(self):
-        """Get a sorted tag list"""
+        """
+        Get a sorted tag list
+        """
 
         return self.tags.order_by('name')
 
     def bump(self):
-        """Bump (move to up) thread"""
+        """
+        Bump (move to up) thread
+        """
 
         if self.can_bump():
             self.bump_time = timezone.now()
@@ -296,14 +321,18 @@ class Thread(models.Model):
         return self.replies.filter(image_width__gt=0).count()
 
     def can_bump(self):
-        """Check if the thread can be bumped by replying"""
+        """
+        Check if the thread can be bumped by replying
+        """
 
         post_count = self.get_reply_count()
 
         return post_count <= settings.MAX_POSTS_PER_THREAD
 
     def delete_with_posts(self):
-        """Completely delete thread"""
+        """
+        Completely delete thread and all its posts
+        """
 
         if self.replies.count() > 0:
             map(Post.objects.delete_post, self.replies.all())
@@ -311,7 +340,9 @@ class Thread(models.Model):
         self.delete()
 
     def get_last_replies(self):
-        """Get last replies, not including opening post"""
+        """
+        Get last replies, not including opening post
+        """
 
         if settings.LAST_REPLIES_COUNT > 0:
             reply_count = self.get_reply_count()
@@ -325,21 +356,34 @@ class Thread(models.Model):
                 return last_replies
 
     def get_replies(self):
-        """Get sorted thread posts"""
+        """
+        Get sorted thread posts
+        """
 
         return self.replies.all().order_by('pub_time')
 
     def add_tag(self, tag):
-        """Connect thread to a tag and tag to a thread"""
+        """
+        Connect thread to a tag and tag to a thread
+        """
 
         self.tags.add(tag)
         tag.threads.add(self)
 
     def get_opening_post(self):
+        """
+        Get first post of the thread
+        """
+
         return self.get_replies()[0]
 
     def __unicode__(self):
         return str(self.get_replies()[0].id)
 
     def get_pub_time(self):
+        """
+        Thread does not have its own pub time, so we need to get it from
+        the opening post
+        """
+
         return self.get_opening_post().pub_time