ASCII does not have diacritics (marks that are added to a letter, like the dots (umlauts) above vowels in German, or the tilde (~) above the 'n' for the 'ñ' used in Spanish). It was only meant for English and doesn't work well for most other languages. Some English words borrowed from other languages use these marks as well, like "resumé" (see Appendix:English words with diacritics).