Median Follow up of all vs survivng patients

Hi. I am doing an audit of a group of patients with a type of cancer treated at my unit. I have 113 patients, and the period of follow up of all patients is 0 - 86.3 months, with a median of 24.3 months. Not all patients survived. My supervisor has made me change the bit where i quote median follow up to specify "median follow up of surviving patients of 24,3 months". He says I need to put that in because you cant follow up dead patients.But no paper that I have read has it like that. Any comments?