Moving while Prone

[Anthony Jackson]

While there is a special move, crawl, for moving while prone, I can't find any evidence that you can't take a standard move or shift while prone. Am I missing something? One offhand thought is to add to the description of Prone: "+1 per square to movement costs while prone".

 

[Yogurt-in-BC]

It's in the new errata:
Prone [Addition]
Player’s Handbook, page 277
Add “You can’t move from your space, although you can teleport, crawl, or be
forced to move by a pull, a push, or a slide.”