binding a plugin to a lifecycle goal

[EJ Ciramella]

I've written a few maven plugins now, most of the type that should be
called explicitly.
 
I have a new one however, that I'd like to be part of the regular
lifecycle.
 
I have this in my mojo:
 
/**
 * <description>
 * @goal assemble
 * @phase process-resources
 */
 
but when I run "mvn process-resources" it doesn't execute my plugin.
 
What am I doing wrong?