e <a href="#AddingTopicTypes">defining your own topic type</a> or editing the main topics file, you simply add to the keywords list:</p><pre class=Example>Topic Type: Sound Effect
   Keywords:
      sound, sounds
      sound effect, sound effects
</pre><p>It doesn&rsquo;t matter if the keyword was previously defined for a different topic type.&nbsp; Just define it again and the definition will change.</p><p>If you want to add keywords to one of the main topic types from the project file, use <code>Alter