Simplifying integrals



Hi all!

I'm quite new to Maxima, and have quite a trouble to find out how to
simplify integrals.
For ex. I'd like to transform
integrate(a*f(x)+b, x, 0, 1)
to
a*integrate(f(x),x, 0,1)+b

How can I get Maxima to do this for me?

Thanks,
shinjin