Do I have to create proposal for description of work in my contract ?

Hello.

I am a webdesigner and I would like to have a contract for me and for my clients.

I have searched the google for website design contract .
I found few examples of contracts for website designing .

Here is the site with contract template :
http://www.zenfulcreations.com/resou...n_contract.htm

I have the contract template and I understand everyhting . There is "CONFIDENTIALITY" point , "PAYMENT SCHEDULE" and the other points.
And there is "DESCRIPTION OF WORK" point with text :
"A separate Proposal will describe the Work that is required of Consultant for the Client."

My question is : Do I really have to have the seperate proposal desribing the design work or may I have only text that states that I will do the website design for my client ?

Sorry but my english is not good today .

Thanks in advance , Bartek