Why did Iran give prior warning about the attack on US air base in Qatar?

Why did Iran give prior warning about the attack on US air base in Qatar?

When Iran fired missiles at the US air base in Qatar on Monday evening, there were fears of wider escalation. But the Islamic Republic’s attack was contained and largely symbolic. It informed Qatar and the Trump administration about its plans. Here’s why

Interceptor missiles are fired, after Iran’s armed forces say they targeted the Al-Udeid base in a missile attack, as seen from Doha, Qatar. There were reportedly no casualties, as Tehran had informed the US and Qatar about its plan. Reuters