You don't need to add a job description, but of course you can. The term "advisor" is pretty broad. If the current system is working for you, that's great and you should stick with it. If you now have a more specific idea of what an advisor does (ie it has become more concrete since they were first added to the bylaws), you might add a job description. A brief job description might also help in recruiting new people for the post, if needed.
- Craig
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