[NTG-context] List of abbreviations

At the beginning of a report I would like to have a page with an abbreviation listing with for example HTML hypertext mark-up language CSS cascade style sheets etc The distancing where the long explanation starts should be the same at lets say 30mm from the margin and in case it jumps to a next line, it also should continue at 30mm from the margin and not back at the margin. What would be the best way to achieve this? Thanks Jeroen