How to get method documentation?

Hi,
I use DOCU_GET to read the class documentation:
    CALL FUNCTION 'DOCU_GET'
      EXPORTING
    extend_except                = 'X'
        id                           = 'CL'
        langu                        = sy-langu
        object                       = ld_object
      TABLES
        line                         = lt_lines
     EXCEPTIONS
       no_docu_on_screen            = 1
       no_docu_self_def             = 2
       no_docu_temp                 = 3
       ret_code                     = 4
       OTHERS                       = 5
id = CL (Class)
object = Name of the class
How can I read the documentation of a methof in a class?
Tried this and some other DOCU f/m... without success.
Thx & regards
Michael

DOCU_READ with object = CLASS and METHOD+30(30)

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          From: Ned Murphy <[email protected]>
    To: Mordecai benHerschel <[email protected]>
    Sent: Wednesday, March 18, 2015 7:27 PM
    Subject:  I have installed both Audition 3 and Photoshop CS3 on a laptop with no Internet connection. How may they be activated? The methods documented in the software don't work.
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