New rule, is it ok?

New rule i’ve tried to make, is it written ok if it also applies to decus–>déçus ? plural? or should i set up a new rule for it?

<rule id="ID" name="déçu">    
 <pattern>
  <token inflected='yes'>decu</token>
 </pattern>
 <message><suggestion>déçu</suggestion></message>
 <example type='incorrect'><marker>decu</marker></example>
 <example type='correct'>déçu</example>
</rule>

Thanks! In the rule editor, you can add more examples with the “Add another wrong example” link, to test the rule on more sentences. Anyway, as this rule only contains a single word, the error should actually be detected by a spell checker, shouldn’t it?