The charter documents of a corporation proposing to issue convertible preferred shares or the indenture or other instrument pursuant to which convertible debt securities or options or warrants are proposed to be issued should normally contain an appropriate antidilution provision providing for an adjustment of the number of shares into which such shares or units are convertible or the number of shares purchasable pursuant to such options or warrants upon any stock split or stock dividend or other recapitalization of the issuer. Such charter documents or indenture or other instrument may also provide for a similar adjustment upon the issuance of additional common stock by the issuer for a consideration less than the conversion price of the options or warrants for less than the then current market price for the common stock.