diff --git a/examples/how_this_code_will_be_used.py b/examples/how_this_code_will_be_used.py
index a1071e6759770b4dbd9b2fd5a6773ca57ce17694..bccbf390be631d14820ef4ca0d0cf8723db5207c 100644
--- a/examples/how_this_code_will_be_used.py
+++ b/examples/how_this_code_will_be_used.py
@@ -3,19 +3,28 @@ from astropy.io import fits
 from csst.core.processor import CsstProcessor
 from csst.msc.data_manager import CsstMscDataManager
 
-from csst_proto import flip_image
+from csst_proto.top_level_interface import flip_image
 
 
 class CsstProcFlipImage(CsstProcessor):
-    """ This processor absorbs photons """
+    """ This processor flips images """
 
     def __init__(self, dm: CsstMscDataManager, n_jobs: int = 1):
+        """
+
+        Parameters
+        ----------
+        dm:
+            csst data manager, used to manage the input/output file paths
+        n_jobs:
+            number of jobs launched
+        """
         super(CsstProcFlipImage, self).__init__()
         self.dm = dm
         self.n_jobs = n_jobs
 
     def run(self, debug: bool = False):
-        """ run this processor
+        """ flip images for all detectors
 
         Parameters
         ----------
@@ -24,10 +33,10 @@ class CsstProcFlipImage(CsstProcessor):
 
         Returns
         -------
-
+        a list of flipped images
         """
         img_flipped_list = joblib.Parallel(n_jobs=self.n_jobs)(
-            joblib.delayed(CsstProcFlipImage.run_one_chip)(this_ccd_id)
+            joblib.delayed(CsstProcFlipImage.run_one_detector)(this_ccd_id)
             for this_ccd_id in self.dm.target_ccd_ids)
         return img_flipped_list
 
@@ -40,8 +49,8 @@ class CsstProcFlipImage(CsstProcessor):
         return
 
     @staticmethod
-    def run_one_chip(dm, ccd_id):
-        """ run for one chip
+    def run_one_detector(dm, ccd_id):
+        """ run for one detector
 
         this function
         """