A cell array doesn't have the facility for headers, per se; if you add to it you've effectively created more data -- and when you go to use the data, then you have to remove or not reference that row to operate on the data alone. This is a lot of effort.
I'd suggest to use a table instead; you get the header effectively for free from the column/variable names.
tC=cell2table(C,'VariableNames',{'Type','Latency','Description'});
