How do i capitalize a word when using Dictation on MacBook Air?

I use Dragon Dictate a lot and I almost always dictate emails, etc., on my iPhone and iPad. If I want to capitalize the first letter of a word in any of these scenarios, I just say "cap" before I say the word.

Dictation on my Macbook Air doesn't do this. I have looked all through the commands for Dictation and there doesn't seem to be one for capitalizing the first letter of a word. Can this be true?

Thank you,

Ian