Does anyone know how to combine CSS classes for an element in the same tag WITHOUT using an additional <span> tag? I know I've read about it and seen this done, but now I forget and can't find where I read it.

For example:

<p class="someclass"> Hello </p>

I want to add a 2nd class
without doing:

<span class="another">
<p class="someclass"> Hello </p>

I saw a tip once that combined classes in one tag, but I can't remember the proper syntax.