diff --git a/api/v1/serializers.py b/api/v1/serializers.py
index 8ff6f44a..8ec39b54 100644
--- a/api/v1/serializers.py
+++ b/api/v1/serializers.py
@@ -27,6 +27,7 @@ class MaterialSerializer(serializers.ModelSerializer):
 
         read_only_fields = (
             'id',
+            'cover',
             'created_at',
             'update_at',
         )
@@ -59,9 +60,9 @@ class CategorySerializer(serializers.ModelSerializer):
             'title',
         )
 
-    read_only_fields = (
-        'id',
-    )
+        read_only_fields = (
+            'id',
+        )
 
 
 class CourseSerializer(serializers.ModelSerializer):
@@ -97,6 +98,11 @@ class CourseSerializer(serializers.ModelSerializer):
         )
 
 
+class CourseRetrieveSerializer(CourseSerializer):
+    category = CategorySerializer()
+    materials = MaterialSerializer(many=True)
+
+
 class LessonSerializer(serializers.ModelSerializer):
 
     class Meta:
diff --git a/api/v1/views.py b/api/v1/views.py
index 744e7b13..97ff71de 100644
--- a/api/v1/views.py
+++ b/api/v1/views.py
@@ -15,6 +15,7 @@ from .serializers import (
     UserSerializer, UserPhotoSerializer,
     LessonSerializer, ContentImageSerializer,
     GalleryImageSerializer, CoverImageSerializer,
+    CourseRetrieveSerializer,
 )
 from .permissions import IsAdmin, IsAdminOrIsSelf, IsAuthorOrAdmin, IsAuthorObjectOrAdmin
 
@@ -59,6 +60,8 @@ class CourseViewSet(ExtendedModelViewSet):
     ).all()
     serializer_class = CourseSerializer
     serializer_class_map = {
+        'list': CourseRetrieveSerializer,
+        'retrieve': CourseRetrieveSerializer,
         'upload_photo': CoverImageSerializer,
     }
     filter_fields = ('category', 'status', 'is_infinite', 'is_featured',)