Avocado tip

I really enjoy avocados and guacamole. I had stopped buying fresh avocados since I could rarely eat them at the right time. I either cut into them when they were under-ripe or let them go too long and they were bad. I read a tip somewhere that you should ripen the avocado until it feels soft to the touch and gives a little. Then, put it in your fridge. It will not ripen further. It works! I have had PERFECT avocados that have been in the fridge for at least a week. I mean delicious and perfect...not a brown spot in sight. I figured that this must not be common knowledge since other friends have complained of this same dilemma. So buy avocados with confidence you guacamole fans.