Special hilighting for comments

[Heime]

I have seen that emacs-lisp-mode allows the highlighting of some specially 
formatted comments using strings enclosed by single quotes 'this-thing'.  This 
can be very useful beyond its intended use (highlighting function and variable 
names).  

For instance, I can use this to highlight the first comment with a different 
colour from the rest of the comments. 

But this special highlighting only works for function and variables names 
without spaces.  

So I cannot do the following to get 'A Remark here' highlighted in a different 
colour.

;; 'A Remark here'   
;; Some comment here
;; Another comment here
;; You are a hero

Can the use of '' be extended so I can use the highlighting more generally as 
described.  Or perhaps have an additional highlighting for more general things, 
separate from function and variable names.