Airport Express doesn' extend my network

[remybee]

Is it possible to extend my wifi network with my Airport express, knowing that my airport express is not connected by ethernet ?

Thanks !
Rémy

 

[ElDiabloConCaca]

Yes, but only if your wireless network is being served by an AirPort Extreme or another AirPort Express.

http://lmgtfy.com/?q=airport+express+extend+network