Ubuntu-Mate encrypted drive, df -h doesn't list everything?

I just installed Ubuntu-Mate for the first time. I decided to set it up with the encrypted drive. I was working on something, and noticed that df -h doesn’t list /dev/sda3, which is my main partition. It does show the amount of space remaining in the file browser, and in the Drives under the Control Center. I’m guessing that this is due to the drive being encrypted, but I’m not sure. Is there a way to fix it so that df -h works correctly?

Thanks!