Typing Yale diacritics (tone markers) on a MacBook Air (Yosemite) By default I am able to type in an acute accent ( ´ ) for rising tones and a grave accent ( ` ) for falling tones, but not a macron ( ¯ ) for high level tones. In order to enable macrons I had to add the U.S. International keyboard as follows: - Select System Preferences from the Apple menu (top left hand corner). - Click the Keyboard icon and then click the Input Sources tab. - Click + and highlight English in the left column. - Select U.S. Extended and click Add. Now I can select the U.S. Extended Keyboard from the Input Menu bar at the top of the screen by the date display. After selecting the U.S. Extended Keyboard I am able to enter: Macrons with: Option Key + A, For example: Option Key + A, A = ā Acute accent with: Option Key + E, For example: Option Key + E, A = á Grave accent with: Option Key + `, For example: Option Key + `, A = à Now I can easily type Yale directly in my emails and documents. Ngóh jān haih hóu hōi sām!