Resume Addendums

What are your thoughts about attaching a resume addendum when applying for a job?  Basically a resume addendum is a one page version of your resume, but with more details of a specific job or skill.

For example, my career is in Electrical Engineering and I was asked today by a recruiter to add more detail for one job and he suggested that I could add it as a separate addendum.  So, I basically used my resume as the template to build the addendum.  In it, I added the details of my related projects, courses and training with some of the other aspects of the 1st resume, like my name, job title, objective and education.  This resume addendum reminds me of a functional resume, but the huge gap in my related experience is justified, because I have already accounted for the time in the original chronological resume that was submitted.

Tell me your thoughts of submitting an addendum (in the form of a shortened, but detailed resume). The recruiter was very pleased with the format.