What Apache Setting am I looking for?

I have a client who has Apache installed but who cannot type a directory
name to get a listing of the directory or see the index file.  They need to
add a trailing slash to see this.  For example:

www.client.com/webstuff  gives a 404 error but
www.client.com/webstuff/  works as expected (shows listing or contents of
index.html)

I know there is a setting to allow the former to be used, I just cannot
recall what it is.  We're using Apache 1.2.6.  All help appreciated.

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Steve Mount, Software Engineer            steve(at)saltyrain.com
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