Add comments explaining exit codes
Add comments explaining exit codes

mharkus/Sia,ericflo/Sia,ChrisSchinnerl/Sia,johnathanhowell/Sia,mtlynch/Sia,mnsl/Sia,mtlynch/Sia,MrStrong/Sia,mharkus/Sia,ChrisSchinnerl/Sia,rivine/rivine,MrStrong/Sia,ericflo/Sia,NebulousLabs/Sia,rivine/rivine,NebulousLabs/Sia,mnsl/Sia