diff --git a/stude/study_groups/migrations/0002_studygroup_landmark.py b/stude/study_groups/migrations/0002_studygroup_landmark.py
new file mode 100644
index 0000000..c056a83
--- /dev/null
+++ b/stude/study_groups/migrations/0002_studygroup_landmark.py
@@ -0,0 +1,20 @@
+# Generated by Django 4.2.3 on 2023-09-24 10:59
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('landmarks', '0001_initial'),
+        ('study_groups', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='studygroup',
+            name='landmark',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, to='landmarks.landmark'),
+        ),
+    ]
diff --git a/stude/study_groups/models.py b/stude/study_groups/models.py
index 9aa761e..89e1d51 100644
--- a/stude/study_groups/models.py
+++ b/stude/study_groups/models.py
@@ -13,6 +13,8 @@ class StudyGroup(models.Model):
     subject = models.ForeignKey(Subject, on_delete=models.CASCADE)
     active = models.BooleanField(default=False)
     timestamp = models.DateField(auto_now_add=True)
+    landmark = models.ForeignKey(
+        'landmarks.Landmark', on_delete=models.SET_NULL, null=True)
 
     def __str__(self):
         return self.name
diff --git a/stude/study_groups/serializers.py b/stude/study_groups/serializers.py
index 19cdec3..2362576 100644
--- a/stude/study_groups/serializers.py
+++ b/stude/study_groups/serializers.py
@@ -6,9 +6,16 @@ from drf_extra_fields.geo_fields import PointField
 from landmarks.models import Landmark
 
 
+class CustomUserKeyRelatedField(serializers.PrimaryKeyRelatedField):
+
+    def to_representation(self, value):
+        # returns the string representation of the custom user (aka the name)
+        return str(value)
+
+
 class StudyGroupSerializer(serializers.ModelSerializer):
-    users = serializers.SlugRelatedField(
-        queryset=CustomUser.objects.all(), many=True, slug_field='full_name', required=False, allow_null=True)
+    users = CustomUserKeyRelatedField(
+        queryset=CustomUser.objects.all(), many=True)
     subject = serializers.SlugRelatedField(
         many=False, slug_field='name', queryset=Subject.objects.all(), required=True, allow_null=False)
     location = PointField()