Update README.md

README.md

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 # How it works
 
 Press and hold a letter that supports diacritic marks, then press space bar or arrow key to select the accent. For example <kbd>E</kbd> + <kbd>Space</kbd>. With spacebar, repeat presses to change accent mark. When releasing the letter key, the accented letter is inserted.
+> Note: Some characters (like `¡` for Spanish are available with the comma (`,`) key).
 
 The software is currently working with the most of accents for several (Latin script based) countries, including **Czech**, **German**, **France**, **Maori** and many others. The list can be found in [Languages.cs](/PowerAccent.Core/Languages.cs).
 If any language is missing, don't hesitate to [create an issue][newissue].