Illustrator uses Proximity language dictionaries to determine when to hyphenate words. These dictionaries let you specify a different language for as little as a single character of text. You can select a default dictionary and customize the dictionary in the Preferences dialog box.
To choose a default hyphenation dictionary, select an option for Default Language, and click OK.
To add a word to the exceptions list, type the word in the New Entry text box, and click Add.
To remove a word from the exceptions list, select the word, and click Delete.