If it is all halal, no need to tell them about your commission.

I do online jobs. In there if i make someone open an id there and if he works in that website, i will get commission. Should i have to say it to the person who open id in my reference that i will get a commission if he open the id there and work. I doubt some people will not open id if i say i will get commission, they are jealous of me. Is it permissible to not tell them about the commission?