diff --git a/atlas/models.py b/atlas/models.py
index 19338d70..14f24e39 100644
--- a/atlas/models.py
+++ b/atlas/models.py
@@ -811,6 +811,7 @@ class CaseCollection(ExamOrCollectionGenericBase):
     )
 
     exam_user_status = GenericRelation(ExamUserStatus)
+    cid_user_exam = GenericRelation(CidUserExam)
 
     feedback_once_collection_complete = models.BooleanField(default=True, help_text="If true feedback is only given once the collection is complete. If false feedback is given after each case.")
 
diff --git a/generic/models.py b/generic/models.py
index 0baf1e26..211d4d0f 100644
--- a/generic/models.py
+++ b/generic/models.py
@@ -1384,6 +1384,11 @@ def get_next_cid():
 
 
 class CidUserExam(models.Model):
+    """This holds the current status of the exam for a candidate
+    
+    Contrast with ExamUserStatus which holds the status changes for a candidate 
+    (and should be merged into here)
+    """
     content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
     object_id = models.PositiveIntegerField()
     exam = GenericForeignKey("content_type", "object_id")