Very good app but no drop D tuning

I love this app it has a lot of uses and as a beginner for the electric guitar but I like a lot of songs in drop D tuning but there is no drop D tuning. I really hope the creators see this review so they can add this verse but in any other tuning it is very useful for just a free app and its probably better than app you would buy. Dont think as this as I mm saying this is a bad app its great.

Ac3dabeast67 about GuitarTuna: Tuner Chords Tabs, v4.0.5