Add some comments
Add some comments

DDShadoww/grab,lorien/grab,pombredanne/grab-1,raybuhr/grab,codevlabs/grab,huiyi1990/grab,DDShadoww/grab,alihalabyah/grab,liorvh/grab,maurobaraldi/grab,raybuhr/grab,shaunstanislaus/grab,alihalabyah/grab,SpaceAppsXploration/grab,istinspring/grab,SpaceAppsXploration/grab,liorvh/grab,kevinlondon/grab,kevinlondon/grab,shaunstanislaus/grab,giserh/grab,istinspring/grab,maurobaraldi/grab,huiyi1990/grab,pombredanne/grab-1,giserh/grab,lorien/grab,codevlabs/grab