Application's update feature use case

help me to describe the use case update feature in an application. For example, the开发者_如何学编程 actor run the update feature on system/application and then the system will send request/interact with a website who provide the data. I hope u can give an example image that describes the use case. thx

Your basic Use Case should describe the "Update [Entity]" feature, one Actor(Stick Figure) and one Use Case (Oval). The text for the use case should describe the steps in the update including the request/interact step. I would normally use an activity diagram to visualize the flow of the steps, and keep the use case diagram simple.