We incorporate the concept of unawareness into the delegation model, and study the communication outcome followed by a delegation problem between a financial expert and a client who is only partially aware of the possible economic environments. Our results show that the expert is always willing to reveal all the possible states when the client is aware of a large set of possible states, while only disclose partially or even nothing when the client is aware of a small set of possible states, providing a rationale for mandatory disclosure policy