That bottom shelf in my fridge door is quite low, but holds many smaller items. To make it much easier to locate the correct bottle of sauce, salad dressing, etc. quickly, I write the name on the lid when I open a new item. Now I can tell the Catalina dressing from the French with ease. My smaller children, who can see that shelf more easily, still use these top labels instead of the front labels to locate what they need.
(Use permanent marker, when the lid is completely dry, for the best results.)