That is all you need for your personal Adsense account.

Your other ad companies should provide you with their own ads.txt lines (so add them to the txt file as needed). Additionally, if any of them use Adsense themselves, you'll have to input those into your ads.txt as well (and label it as RESELLER).

So for one of my sites (using Adsense and Medianet), it looks like this...

#Ads.txt sitename-dot-com

google.com, pub-xyz, DIRECT, xyz (my personal Adsense acct)
media.net, xyz, DIRECT (medianet's basic acct info)
google.com, pub-xyz, RESELLER, xyz (medianet's Adsense acct)

This is the first line of my ads.txt file.

#Ads.txt example.com

This is the message I get when I try to validate it:

Line 1: The ads.txt validator could not parse this line.
Please make sure it follows the format specified by the IAB

Does anyone know what could be wrong?

@Tom1961 - more info here:
Ads.txt [webmasterworld.com]

@azlinda - remove that line

Thank you, keyplyr!

@azlinda - the commented line(s) should not cause an error. Some ads.txt validator tools error the comment, others do not.

Just a FYI- any tool is created by someone to check against one or more metrics. This may be biased toward specifics of design, application or purpose and not correctly reflect your intended use.

Always use more than one tool to check any file for errors.

I have a stupid question on ads.txt...is the # actually part of the syntax?

@Unshiny - no.

When a "#" starts a line, it blocks that line from being parsed.

The "#" is called a "comment" because many programmers leave comments in their code to help other understand the code.

The entire commented line can be removed, or left there.

I've found this validator accurate: [adstxt.adnxs.com...]

@Keyplyr - that's the validator I use. I have a friend who has the same #comment line at the top of her ads.txt file, and it passes with flying colors. Mine didn't.

Well there's really no reason to include *any* commented lines in ads.txt, unless you are using several ads.txt files for different sites and you want to remember which applies to which site.

For a site that uses one Adsense account, all you need is:

google.com, pub-************, direct

You would think that the validators would ignore the comment lines.

They usually do, but as I said a couple posts above, tools can be buggy.

There also may have been something odd about that comment line of yours; possibly some proceeding spacing.

There also may have been something odd about that comment line of yours; possibly some proceeding spacing.

Nope, it's rock solid! It's most likely a buggy tool as you said.

PubGalaxy has also asked me to add Ads.txt. According to them, I should be using it even if I have only AdSense and Adx, why?

@Tom Please share your experience with PubGalaxy.