I would agree with Derek, it indicates 1.89 acres in Oakland County Public Records online. Evidently, information submitted to Trulia by the County was in error.
If and when you place your home on the market, it will be corrected by the agent.
The way the data feeds work, you may not get very far contacting Trulia, as that is automatically pulled-in and not always correct the way it gets translated. I wouldn't worry too much about it if I were you.