Mismatches in process_bwt

Hello, I was going into your code and I found the following line in process_bwt function:

if words[5].count(':') < args.missmatch:

Shouldn't it be the opposite? if words[5].count(':') > args.missmatch:

Since we want to remove any alignment with more mismatches than the threshold given in the args? or probably I misunderstood something. 

Thanks for the clarification!