If you want to distribute your map, you should include a text file with it. The text file should be called <mapname>.TXT and it should follow a format like the following example.

================================================================
Title                   :
Date Completed          : (differentiates versions of the same map)
Filename                : <mapname>.MAP
Author                  : Your name here
Email Address           :
Misc. Author Info       :
Other Levels            :

Description             :

Additional Credits      :
================================================================

* Play Information *

Single Player           : Yes/No
Cooperative 2-8 Player	: Yes/No
DukeMatch 2-8 Player    : Yes/No
Difficulty Settings     : Yes/Not implemented
Atomic Edition Required : Yes/No
New Sound               : Yes/No
New Music               : Yes/No
New Art                 : Yes/No
Modified CONs           : Yes/No
Demos Replaced          : None/1/2/3

* Construction *

Base                    : New level from scratch/Modified E#L#/<mapname>.MAP
Build Time              :  
Editor(s) used          :
Known Bugs              :
May Not Run With...     :

Important Notes         :

* Copyright / Permissions *

Authors (MAY/MAY NOT) use this level as a base to build additional
levels.  

(One of the following)

You MAY distribute this MAP file through any electronic medium, so long as 
you include this text file intact with no modifications.

You MAY NOT distribute this MAP file by any means.

You may do whatever you want with this file.