A sample side letter that may be used by a fiduciary of an employee benefit plan subject to the Employee Retirement Income Security Act of 1974 (ERISA) to invest in an investment fund that intends to comply with the 25% test under the Department of Labor (DOL) plan assets regulation, as modified by ERISA Section 3(42). This side letter is designed for an ERISA plan's investment in a private equity fund or hedge fund that is structured as a limited partnership, but can be modified for different types of investments and investment vehicles. This Standard Document has integrated notes with important explanations and drafting tips.