Service Trip Explanation

This summer I went on a two week service intensive trip and want to include it on my activities section. I raised all the money for the trip (my parents did not pay a penny for it). I ran out of room to include that in the description… should I write a sentence or two about it in the additional information? I want to plan on majoring in global health and this trip was very important to me and I don’t want it to get brushed off like my parents just wrote a check and sent me away for a couple weeks. Any suggestions?