Add a message in a standard WD

Dear Friends:

    We are going to use this WD for our W2 online: HRESS_C_ONLINE_W2_REPORT, we would like to add a message there, so that all employees can see it while seeing their W2.

   I was thinking about enhancing method WDDOINIT so that a popup is triggered once this WD is accessed, or add an static text somewhere in the webdypro view. Which option do you think is the better in terms of easiness to implement? Also, do you know a way to trigger a popup in the WD (possible in the method WDDOINT)  which does not affect the rest of the logic?

Thanks and regards!