diff --git a/lms/djangoapps/course_home_api/dates/v1/serializers.py b/lms/djangoapps/course_home_api/dates/v1/serializers.py
index e246226105..0f40993f93 100644
--- a/lms/djangoapps/course_home_api/dates/v1/serializers.py
+++ b/lms/djangoapps/course_home_api/dates/v1/serializers.py
@@ -14,6 +14,7 @@ class DateSummarySerializer(serializers.Serializer):
     """
     Serializer for Date Summary Objects.
     """
+    complete = serializers.NullBooleanField()
     date = serializers.DateTimeField()
     date_type = serializers.CharField()
     description = serializers.CharField()
diff --git a/lms/djangoapps/course_home_api/dates/v1/views.py b/lms/djangoapps/course_home_api/dates/v1/views.py
index 2f67db1f7e..0fc25e0f05 100644
--- a/lms/djangoapps/course_home_api/dates/v1/views.py
+++ b/lms/djangoapps/course_home_api/dates/v1/views.py
@@ -36,6 +36,8 @@ class DatesTabView(RetrieveAPIView):
         Body consists of the following fields:
 
         course_date_blocks: List of serialized DateSummary objects. Each serialization has the following fields:
+            complete: (bool) Meant to only be used by assignments. Indicates completeness for an
+                assignment.
             date: (datetime) The date time corresponding for the event
             date_type: (str) The type of date (ex. course-start-date, assignment-due-date, etc.)
             description: (str) The description for the date event