Pinchas 5772

The daughters of Tzelafchad approach Moshe to see if they can inherit their father's land. They mention to Moshe that their father had died and specifically say he wasn't part of Korach's rebellion. Why was it necessary to add that in? Why not just say he died of old age? The Ramban answers this is because they were worried Moshe wouldn't show compassion towards them since he hated the sin of Korach more than any other sin.