added comment

main.py

@@ -25,6 +25,7 @@ for filename in os.listdir(directory):
             cv2.waitKey(1)
             manpage = input("please input the number on the page (if the title is correct, enter nothing)")
             print(manpage)
+            #check if the new name already exists
             if manpage == "\n":
                 rng = numpy.random.default_rng().random()
                 os.rename (f'images/{data}.jpg', f'images/{data}.review-{rng}.jpg')