Has there been any conversation about poly relationships between you and your husband? Is he familiar with the term and concept?
How did you find out about poly? Did you read an article or see something on TV or read a book on poly? Maybe whatever means you learned about poly, you could show your husband and just say something along the lines of, I kind of found this interesting....
And let the conversation grow from there. He may show some interest or he may dismiss it altogether not feeling it is right....
Look forward to hearing how thing go once the conversation starts...
The characters in another chapter we call life!
T - Wife - Poly
J - Husband Poly