Google announced a lot of things today, but some it didn’t all make into the Google I/O keynote.

On the Gmail blog, Google announced new Google Wallet integration for Gmail, which comes in the form of an “Attach Money” button. Yep, you can send money as an attachment. A pretty good idea, as long as it doesn’t land in the spam folder.

The feature lets you send money by email even if the recipient does not have a Gmail address.

“It’s free to send money if your bank account is linked to Google Wallet or using your Google Wallet Balance, and low fees apply to send money using your linked credit or debit card,” says Google Wallet product manager Travis Green. “To send money in Gmail, hover over the attachment paperclip, click the $ icon to attach money to your message, enter the amount you wish to send, and press send.”

The feature will only be available for desktop at first, but will likely come to mobile Gmail in the future. In the meantime, you can still use the Google Wallet app or wallet.google.com.

The feature is rolling out over the coming months to U.S. Gmail users who are 18 and over.