How to install share assembly at client machine

Question

In my project I have a assembly that has a strong name and I have kept it
in my GAC. I prepare a set-up of my project and install my application on client
machine by this set-up but that particular assembly is not accessible at client machine. set-up didnt copy that assembly in GAC on client machine. Now my Question that If i have to copy that assembly on client GAC or there is some other way-out. I am sure this will not be a correct option I must be missing some thing.