I recommend that you use the introduction as a declaration of the significance of a mature enterprise capability in the organization.
I usually recommend the following boiler-plate introduction:
The enterprise architecture document captures and explains the design of the business model execution setup, which facilitates continued business operation, development and growth.
Enterprise architecture is not an isolated function in the organization, but rather part of the corporate culture. The enterprise capability is built into every process, and everyone is encouraged to contribute to its continuous improvement.
Building consensus about this is essential for any continued work on capturing and hopefully improving the existing enterprise architecture.
Achieving this consensus is often the first challenge you need to overcome to get anywhere at all.