I am resign from my current organisation my last working day is 22 Oct 2016, but now a new clause is added to my resignation acceptance that " by signing this letter you accept that you are not going to join any business competitor for next 6 month" can a company add this type of clause at any point of time. I am not accept this letter and refuse to sign as I am going to join the same line of business with other organisations. Please suggest me what to do