It means you don't have to file your tax return.
Not everyone is required to file a tax return. If your income is lower than a certain dollar amount (set by the IRS), the IRS allows you not to file your tax return, you are considered by the IRS to be below filing requirements.
The link below will detail that set amount, which indicates if you need to file or not:
https://ttlc.intuit.com/replies/3302274