[Plugin: W3 Total Cache] W3TC and RSS validation

I just noticed that my RSS feed has additional text that W3TC appears to insert. https://feedvalidator.org/check.cgi?url=http%3A%2F%2Fwww.realworldtech.com%2Ffeed%2F is the validator check.

Everything looks fine up until:

Time = 219.51 ms
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Served from: https://www.realworldtech.com @ 2012-09-06 15:07:55 –>

Why is that text getting injected? I have feed caching enabled, but when I disable feed caching on my test system, the problems are still there.

Is there some setting I need to disable?

David

https://www.ads-software.com/extend/plugins/w3-total-cache/