diff --git a/boards/models/tag.py b/boards/models/tag.py
--- a/boards/models/tag.py
+++ b/boards/models/tag.py
@@ -15,6 +15,10 @@ ARCHIVE_POPULARITY_MODIFIER = 0.5
 class TagManager(models.Manager):
 
     def get_not_empty_tags(self):
+        """
+        Gets tags that have non-archived threads.
+        """
+
         tags = self.annotate(Count('threads')) \
             .filter(threads__count__gt=0).filter(threads__archived=False) \
             .order_by('name')
@@ -42,13 +46,22 @@ class Tag(models.Model):
         return self.name
 
     def is_empty(self):
+        """
+        Checks if the tag has some threads.
+        """
+
         return self.get_thread_count() == 0
 
     def get_thread_count(self):
         return self.threads.count()
 
     def get_popularity(self):
-        all_post_count = Post.objects.all().count()
+        """
+        Gets tag's popularity value as a percentage of overall board post
+        count.
+        """
+
+        all_post_count = Post.objects.count()
 
         tag_reply_count = 0.0
 
@@ -61,6 +74,10 @@ class Tag(models.Model):
         return popularity
 
     def get_linked_tags(self):
+        """
+        Gets tags linked to the current one.
+        """
+
         tag_list = []
         self.get_linked_tags_list(tag_list)
 
@@ -80,7 +97,9 @@ class Tag(models.Model):
             linked_tag.get_linked_tags_list(tag_list)
 
     def get_font_value(self):
-        """Get tag font value to differ most popular tags in the list"""
+        """
+        Gets tag font value to differ most popular tags in the list
+        """
 
         popularity = self.get_popularity()
 
@@ -91,6 +110,10 @@ class Tag(models.Model):
         return str(font_value)
 
     def get_post_count(self, archived=False):
+        """
+        Gets posts count for the tag's threads.
+        """
+
         posts_count = 0
 
         threads = self.threads.filter(archived=archived)