You can pass the value through the event parameter. That's fine. Or you can do something like Richa Gupta presented (anyhow this requires one additional step in the workflow which I many times try to avoid).
One thing that you should consider is the possible language requirements. Where you do actually want to show this description? Let's say you get the description in English, but the user is using SAP in Spanish. Probably this is not a problem, but worth to check before implementing something.
Regards,
Karri