Shouldn't there be a "Don't forget to sign your tax document before you send it in the mail." message after you print you tax documents? I had a few people forget to sign

[stajanoski01]

Since I couldn't find a feedback section, I thought I'd propose the idea here since I see a lot of people making the same mistake and getting penalized. 
It seems to be a routine thing in my family and with some friends that they forget to sign their tax document before sending their tax in the mail. I'd imagine it can't be a that uncommon if this many people were doing it. It might be a very good idea to incude that message after you print your tax documents and send it through mail. Anyhow, I love the TurboTax product and I thank everyone for doing an amazing job.

[DoninGA]

On the File by Mail filing instructions that is the first page of the printout when mailing a tax return, the following is included -

Your tax return - The official return for mailing is included in this printout.
Remember to sign and date the return.