Formula Description Excel iPad/ios

I noticed that the iPad app on excel does not have formula description text boxes once you type a formula. If I start typing any formula on the desktop Excel, let's say the PMT formula. It requires several cells to be referenced but if I use excel on iPad, I don't know what order it needs to be. If I type "=PMT(" on the desktop Excel, a small rectangular text box will appear just below where I am typing the formula and it would read "PMT(rate,nper,PV,FV,type)", which lets me know the order of which cells to reference. On the iPad version, no such box appears.