diff --git a/apps/course/migrations/0035_comment_deactivated_at.py b/apps/course/migrations/0035_comment_deactivated_at.py
new file mode 100644
index 00000000..cd5ba08e
--- /dev/null
+++ b/apps/course/migrations/0035_comment_deactivated_at.py
@@ -0,0 +1,18 @@
+# Generated by Django 2.0.2 on 2018-03-12 10:05
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('course', '0034_auto_20180215_1503'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='comment',
+            name='deactivated_at',
+            field=models.DateTimeField(blank=True, default=None, null=True),
+        ),
+    ]
diff --git a/apps/course/models.py b/apps/course/models.py
index ad59b1b1..98a64423 100644
--- a/apps/course/models.py
+++ b/apps/course/models.py
@@ -196,7 +196,7 @@ class Material(models.Model):
         ordering = ('title',)
 
 
-class Comment(PolymorphicMPTTModel):
+class Comment(PolymorphicMPTTModel, DeactivatedMixin):
     content = models.TextField('Текст комментария', default='')
     author = models.ForeignKey(User, on_delete=models.CASCADE)
     parent = PolymorphicTreeForeignKey(