How to maintain "System Description" in SAPGUI 7.x

Beside the normal description field of a SID inside SAPLogon there is a column named "System Desciption" (Ger: "Systembeschreibung") in saplogon or saplogonpad.

Where can this field be maintained? Is there an (undocumented?) section inside saplogon.ini or elsewhere (xml?)?

Thanks!