is a space after % required in comments?

[Mark Polesky]

Hi again!

recently I've found some odd behaviors that I 
traced down to some ly % comments that had no 
space between the % and the next character.
Things like 

%what's going on here?

or

%you gotta be kidding me...

And when I changed them both to

% oh, weird...

normal behaviors resumed as far as I can tell.

Is a space required? I didn't see anything 
about this in the manual, so if this is an 
issue, it should be mentioned.

Thanks again. Lilypond is ze best!

- Mark