In share purchase contracts, ancillary letters are sometimes added to insurance and guarantees to deal with issues such as tax liabilities or social issues that the parties do not want the authorities to know about. Signature blocks must conform to the nature of the parties to the correspondence agreement. The person signing the mail contract does so (if duly authorized) on behalf of the legal person. Signature blocks are therefore formatted as they are formatted in normal agreements. Where a fund is willing to trade over-investment rights, it should seek to limit the investor`s discretion in determining an excused investment, as the focus should be on using the investor`s full commitment instead of allowing the investor to choose transactions. Where the volume of prohibited investments is indicated in the subsidiary letter itself, it is generally useful to indicate the reasons why they are prohibited in order to increase the likelihood that the provision will be made outside the scope of a relevant reference right.