Why won't this fade in script for a text box not work?

I just simply want my one player game to have a word at the top that after 5 seconds, fades in. What's wrong with this script?

transparency = script.Parent

wait(5)
transparency.TextTransparency = .9
wait(.25)
transparency.TextTransparency = .85
wait(.25)
transparency.TextTransparency = .8
wait(.25)
transparency.TextTransparency = .75
wait(.25)
transparency.TextTransparency = .7

thanks!