Is CAPTION always necessary?

I have some pages where I have the following structure:

<h1>Users</h1>	
<form id="form1" method="post" action="userAdd.php">	
<table border="1" cellspacing="0" cellpadding="2" rules="rows"
summary="List of application users." width="100%">

This is the only table on the page. Can I get away with not using the
<caption> tag? I think it's pretty evident that we're looking at a table
of users, and don't think it's really necessary.

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Randal Rust
Covansys Corp.
Columbus, OH