Using new variables in front matter

Sorry for asking such a basic question, but I can't seem to find what I'm looking for in the documentation.

I am trying to add a new variable to the front matter of my entries, called "synopsis". This is what my front matter looks like:

title: Title
categories: Testing
synopsis: Short description.

I can use {{ title }} and {{ categories }} tags as normal in my theme, however {{ synopsis }} doesn't output anything. Similarly I can't see it from the control panel as a field.

Is there somewhere I need to register this new variable before I can use it?

Answered by Jason Varga!
>>>>>>> Answered <<<<<<<
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