diff --git a/django_etesync/migrations/0015_collectionitemrevision_salt.py b/django_etesync/migrations/0015_collectionitemrevision_salt.py
new file mode 100644
index 0000000..f5553c9
--- /dev/null
+++ b/django_etesync/migrations/0015_collectionitemrevision_salt.py
@@ -0,0 +1,18 @@
+# Generated by Django 3.0.3 on 2020-06-04 12:18
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('django_etesync', '0014_auto_20200602_1558'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='collectionitemrevision',
+            name='salt',
+            field=models.BinaryField(default=b'', editable=True),
+        ),
+    ]
diff --git a/django_etesync/models.py b/django_etesync/models.py
index 18c14a9..53239e7 100644
--- a/django_etesync/models.py
+++ b/django_etesync/models.py
@@ -115,6 +115,7 @@ class CollectionItemRevision(models.Model):
     stoken = models.OneToOneField(Stoken, on_delete=models.PROTECT)
     uid = models.CharField(db_index=True, unique=True, blank=False, null=False,
                            max_length=43, validators=[Base64Url256BitlValidator])
+    salt = models.BinaryField(editable=True, blank=False, null=False, default=b'')
     item = models.ForeignKey(CollectionItem, related_name='revisions', on_delete=models.CASCADE)
     meta = models.BinaryField(editable=True, blank=False, null=False)
     current = models.BooleanField(db_index=True, default=True, null=True)
diff --git a/django_etesync/serializers.py b/django_etesync/serializers.py
index 178c914..1f5d3c2 100644
--- a/django_etesync/serializers.py
+++ b/django_etesync/serializers.py
@@ -106,11 +106,12 @@ class CollectionItemRevisionSerializer(serializers.ModelSerializer):
         queryset=models.RevisionChunkRelation.objects.all(),
         many=True
     )
+    salt = BinaryBase64Field()
     meta = BinaryBase64Field()
 
     class Meta:
         model = models.CollectionItemRevision
-        fields = ('chunks', 'meta', 'uid', 'deleted')
+        fields = ('chunks', 'meta', 'uid', 'salt', 'deleted')
 
 
 class CollectionItemSerializer(serializers.ModelSerializer):