All Luke needed was a specific hashtag and everything would've been fine. But, there was no #sponsor on a certain Instagram post and a certain government agency isn't pleased.

Outdoor retailer Cabela's carries Luke's clothing line, HFE--named for his hit "Huntin' Fishin' and Lovin' Everyday"--and Country Living is reporting that the country superstar violated the Federal Trade Commission's regulations regarding celebrity endorsements.

The FTC requires any celebrity endorser to tag any post promoting products with #sponsor as a means of full disclosure.

But in a recent Instagram post in which Luke was holding up a couple of fishing rods and asking "Which one should I get?," there was no such tag.

The post was immediately removed.

It was obviously removed very quickly, as it doesn't appear in this Country Living blog that brings this particular situation to light.

And you'll notice that the two posts IN the blog feature that tag.

I suspect it was a common oversight.

The man IS only human and likely just made a mistake.

Then again, it might not be a bad idea to make sure someone on his staff double checks that stuff, just in case.