Clarification of the ReachableAddresses option

I have "ReachableAddresses reject :" in torrc and start Tor. Tor obviously cannot connect. Then I add a bridge through Vidalia, and, voila, Tor connects to the Tor network through the bridge, ignoring ReachableAddresses.

Is this expected behaviour? Are bridges exempt from the ReachableAddresses option? My reading of that option in the man page is that it should prevent ALL connections, bridges included. Is this a bug, an error in the man page, or an error in my head?