Bibliography not in ToC

[Rich Shepard]

Running LyX-2.3.6.1 on Slackware64-14.2.

The bibliography settings at the end of the paper indicate the bibliography
should be added to the end of the Table of Contents. It's not. Do I need to
explicitly add that command to the preamble?

I don't recall having this issue before and find no reference to it in my
saved threads of the mail list.

A MWE is attached: .lyx, .pdf, and .bib. I look forward to learning what
I've done incorrectly (or neglected to do at all.)

TIA,

Rich
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