Update README.md

README.md

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 Inspired by https://github.com/fdw/rofimoji but written as rofi-script instead of starting a separate rofi.
 
-It automatically downloads the list of emojis when used for the first time. To avoid that, simply place `emoji.txt` from this repository in `$HOME/.cache/` yourself.
+It automatically downloads the list of emojis when used for the first time. To avoid that, simply place `emoji.txt` from this repository in `$HOME/.cache/` yourself. But don't worry too much, the download is pretty quick (~350kb text file).
 
 ## Prerequisites