Determining whether iOS application was launched via Siri

Determining whether iOS application was launched via Siri

I've been looking forever, but haven't found … Do you know if there's a
way to determine whether my iOS app was launched thru Siri or thru a
regular icon click launch ?
I need to know because I want to automate a "startup" action only when my
app is launched from Siri, not from a regular "app icon click" launch …
I was thinking that maybe application:didFinishLaunchingWithOptions or
some other API would allow my app to know how it was launched, but that
doesn't seem to be the case (or I just missed it !?).
Any idea if there's some trick available that I couldn't use until Apple
publishes some official/public Siri API ?
Thanks for any insight,