Way, way, back we learned that a final l preceded by an e was always doubled when suffixed.
Hence.. repel -> repellant or repelled.
Somewhere along the way, cancelled became canceled, though and now canceled is more widely accepted in the US.



>Hi everybody,
>
>I've checked this link http://grammarist.com/spelling/cancel/ but I am not 100% sure which spelling should I choose. The software is written by US company, but may be used by US, Canadian, NZ and Australian clients. It may also be used internationally in other countries.
>
>So, just wondering what spelling do you prefer in your code?
>
>Thanks in advance.