Renault Laguna Phillips radio cassette with CD point?

Please can some one help me. I own an Renault laguna 1.8 RN 1995 It has a phillips radio cassette player that works fine but there is a little socket in the bottom left corner that has cd marked above it. Does this mean I am able to plug in a portable CD player? If so where do I buy the Leads to do this? Thank you