Brake fluid change is free

for those MB vehicles covered by the free A and B services while under warranty. This was changed about a month ago according to my service advisor. My car is in the shop today to fix a instrument panel bulb problem. I was also going to get the brake fluid changed, but my service advisor said that if I waited for my next B service it would be free. He also said that I would need to remind the service advisor the next time I came in for service. I just realized that my next service will probably be an A service and that will probably be the last service before the warranty ends. I will push to have it done as part of the A service. Why doesn't MB inform the consumer of these changes? I really don't think we should have to depend on the good will of the service department to be informed of these changes.