How to Type in Yoruba

Yoruba is one of the most widely spoken indigenous languages in Africa, spoken by close to 30 million people. It is written with the normal English alphabet plus a few extra “dotted” letters: Ẹ/ẹ, Ọ/ọ, Ṣ/ṣ. Also tone marks are required, grave ` for low and acute ´ for high.

The dotted letters can be made with the US Extended keyboard layout, using Option + x, followed by the base letter. Tones can then be added using Option + Shift + ` and Option + Shift + e

Source

Multilingual Mac: Typing Yoruba. http://m10lmac.blogspot.co.uk/2007/02/typing-yoruba.html