Database class: mapping ER DIAGRAMS

Im just wondering if this looks correct? If not, can you explain what Im doing wrong? I appreciate any answers :)

Using three entities INSTRUCTOR, CLASS, and ROOM draw an ER diagram that depicts the following: each CLASS in a ROOM has one INSTRUCTOR, but each INSTRUCTOR in a room may have many CLASSes, and each INSTRUCTOR of a CLASS may be in many ROOMs CLASS INSTRUCTOR HAVE ROOM