diff --git a/apiserver/apiserver/api/serializers.py b/apiserver/apiserver/api/serializers.py
index 77a629c..c3e8901 100644
--- a/apiserver/apiserver/api/serializers.py
+++ b/apiserver/apiserver/api/serializers.py
@@ -379,6 +379,8 @@ class SessionSerializer(serializers.ModelSerializer):
     datetime = serializers.DateTimeField()
     course = serializers.PrimaryKeyRelatedField(queryset=models.Course.objects.all())
     students = TrainingSerializer(many=True, read_only=True)
+    max_students = serializers.IntegerField(min_value=1, max_value=50, allow_null=True)
+    cost = serializers.DecimalField(max_digits=None, decimal_places=2, min_value=0, max_value=200)
 
     class Meta:
         model = models.Session