diff --git a/flashcards/migrations/0004_auto_20150506_1443.py b/flashcards/migrations/0004_auto_20150506_1443.py
new file mode 100644
index 0000000..af59615
--- /dev/null
+++ b/flashcards/migrations/0004_auto_20150506_1443.py
@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('flashcards', '0003_auto_20150504_1600'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='userflashcard',
+            name='mask',
+            field=models.ForeignKey(blank=True, to='flashcards.FlashcardMask', help_text=b"A mask which overrides the card's mask", null=True),
+        ),
+    ]
diff --git a/flashcards/models.py b/flashcards/models.py
index 61ded13..246532c 100644
--- a/flashcards/models.py
+++ b/flashcards/models.py
@@ -53,7 +53,7 @@ class UserFlashcard(Model):
     3. A user has a flashcard hidden from them
     """
     user = ForeignKey('User')
-    mask = ForeignKey('FlashcardMask', help_text="A mask which overrides the card's mask")
+    mask = ForeignKey('FlashcardMask', blank=True, null=True, help_text="A mask which overrides the card's mask")
     pulled = DateTimeField(blank=True, null=True, help_text="When the user pulled the card")
     flashcard = ForeignKey('Flashcard')
     unpulled = DateTimeField(blank=True, null=True, help_text="When the user unpulled this card")