Custom Instruction

http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/unsure.gif

When I build my project with The Quartus Web-Edition ...

"Warning : SOPC Builder system component custominstruction_cpu is not supported by the simulator. Simulation may be incorrect if your software attempts to access it

Warning : Simulation of custom instructions is not supported in component cpu"

It is normal?

Thanks...