Why we can't use bleach clothes using water with high concentration of iron

Behind a bottle of bleaching clothes usually there are a note or caution do not use this liquid at water with high concentration of iron. Why producer give this caution?
The Chemistry Teacher is answer:
function of bleach is to make a white clothes look so bright, so if we use it at water in high concentration of water, our clothes do not look so bright but will be look yellowish. Why it happen?
The large composition of bleach liquid is sodium hypochlorite (NaOCl) it will be react with iron ion (Fe2+) to produce salt (NaCl) and the solution of iron ion (Fe3+). Fe3+ solution is made the clothes become yellowish, because we know that the color of Fe3+ solution is yellowish.
The Reaction is:
Fe2+     +      NaOCl   --->     NaCl   +    Fe3+

I hope this information is usefully to all......