diff --git a/api/api/products/views.py b/api/api/products/views.py
index 614cb06..3fa8db8 100644
--- a/api/api/products/views.py
+++ b/api/api/products/views.py
@@ -1790,6 +1790,9 @@ class CameraRulesView(BaseView):
         return JsonResponse(make_camera_rules(q), safe=False)
 
 class CameraFrameView(BaseView):
+    '''
+    handle camera frame upload
+    '''
     name = 'camera-frame'
 
     def post(self, request):
@@ -1803,6 +1806,9 @@ class CameraFrameView(BaseView):
         return JsonResponse({})
 
 class FramesView(BaseView):
+    '''
+    get frame list
+    '''
     name = 'frames'
     auth_check = 'admin'
 
@@ -1835,6 +1841,9 @@ class FramesView(BaseView):
             'end': end,
         })
 class FrameView(BaseView):
+    '''
+    get one frame image from oss
+    '''
     name = 'frame'
 
     def get(self, request):
@@ -1842,6 +1851,9 @@ class FrameView(BaseView):
         return HttpResponse(oss_get(path, bucket=settings.FRAMES_BUCKET),
                             content_type='image/jpeg')
 class DeleteFrameView(BaseView):
+    '''
+    delete one frame from oss
+    '''
     name = 'delete-frame'
     auth_check = 'admin'