diff --git a/bookwyrm/migrations/0060_siteinvite_invitees.py b/bookwyrm/migrations/0060_siteinvite_invitees.py
new file mode 100644
index 00000000..acd00977
--- /dev/null
+++ b/bookwyrm/migrations/0060_siteinvite_invitees.py
@@ -0,0 +1,21 @@
+# Generated by Django 3.1.6 on 2021-04-02 00:14
+
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("bookwyrm", "0059_user_preferred_timezone"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="siteinvite",
+            name="invitees",
+            field=models.ManyToManyField(
+                related_name="invitees", to=settings.AUTH_USER_MODEL
+            ),
+        ),
+    ]
diff --git a/bookwyrm/models/site.py b/bookwyrm/models/site.py
index c3c1d8a4..1eb31869 100644
--- a/bookwyrm/models/site.py
+++ b/bookwyrm/models/site.py
@@ -58,6 +58,7 @@ class SiteInvite(models.Model):
     use_limit = models.IntegerField(blank=True, null=True)
     times_used = models.IntegerField(default=0)
     user = models.ForeignKey(User, on_delete=models.CASCADE)
+    invitees = models.ManyToManyField(User, related_name="invitees")
 
     def valid(self):
         """ make sure it hasn't expired or been used """
diff --git a/bookwyrm/views/authentication.py b/bookwyrm/views/authentication.py
index eef5c79f..22689a28 100644
--- a/bookwyrm/views/authentication.py
+++ b/bookwyrm/views/authentication.py
@@ -108,6 +108,7 @@ class Register(View):
         )
         if invite:
             invite.times_used += 1
+            invite.invitees.add(user)
             invite.save()
 
         login(request, user)