diff --git a/studyguides/apps/courses/models.py b/studyguides/apps/courses/models.py
index 135baa8..fef3f98 100644
--- a/studyguides/apps/courses/models.py
+++ b/studyguides/apps/courses/models.py
@@ -16,8 +16,6 @@ class Course(models.Model):
     id = models.AutoField(primary_key = True)
     name = models.CharField(max_length=100, unique = True)
 
-    units = models.ManyToManyField("Guide", related_name="course")
-
     def __str__(self):
         return self.name
 
@@ -25,6 +23,7 @@ class Guide(models.Model):
     id = models.AutoField(primary_key = True)
     name = models.CharField(max_length=100)
     
+    course = models.ForeignKey(Course, on_delete=models.CASCADE, null=True)
     url = models.URLField(max_length=300)
 
     def __str__(self):
diff --git a/studyguides/studyguides/apps/courses/migrations/0002_auto_20201015_0934.py b/studyguides/studyguides/apps/courses/migrations/0002_auto_20201015_0934.py
new file mode 100644
index 0000000..d55fed6
--- /dev/null
+++ b/studyguides/studyguides/apps/courses/migrations/0002_auto_20201015_0934.py
@@ -0,0 +1,23 @@
+# Generated by Django 3.1.2 on 2020-10-15 13:34
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('courses', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='course',
+            name='units',
+        ),
+        migrations.AddField(
+            model_name='guide',
+            name='course',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, to='courses.course'),
+        ),
+    ]