Bounsel allows you to digitally sign your documents. Apart from adding parties and signatories, though, you can also fill-in more information to make sure your document is absolutely complete.
Once you add a party, and add a signatory, you can write a name or title to better identify the party (especially if it includes many different signatories) by clicking on "Empty party name".
Furthermore, by clicking on the icon next to the signatory's name you can write additional information on the person signing.
These lines of additional details will appear in the signature box in the text right under the signatory's name.
And that's how you get all of the relevant informations in your contracts.