We are always on the lookout for new information to help refine and extend what is covered. We are looking for contributions in the areas mentioned below in particular, but if you have other information you think may be useful, please reach us at attack@mitre.org. We ask that you provide the technique name, a brief description of how the technique is implemented, and the publicly-available reference. We suggest you take a close look at what we already have on our site, paying attention to the level of abstraction of techniques.”]
Source: https://collaborate.mitre.org/attackics/index.php/Contribute