old_contents: from django.db import models
  
  class Category(models.Model):
      title = models.CharField(max_length=255)
      slug = models.SlugField(unique=True)
      description = models.TextField(blank=True)
  
      class Meta:
          verbose_name_plural = 'Categories'
  
      def __unicode__(self):
          return self.title
  
new_contents: from django.db import models
  
  class Category(models.Model):
      title = models.CharField(max_length=255, 
                               help_text="Maximum 250 characters")
      slug = models.SlugField(unique=True,
                              help_text="Automatically generated from title")
      description = models.TextField(blank=True)
  
      class Meta:
          verbose_name_plural = 'Categories'
  
      def __unicode__(self):
          return self.title
  
subject: Add help text