Here's the article I was thinking about:

How do I know when to move from one phase of Atkins to the next?
You are ready to leave Induction and add more carbohydrates to your meals when you have lost much of the weight you want to shed. Or you may be bored with the options available on the Induction phase and willing to trade a slow-down in the progress of your weight loss in return for eating a wider variety of foods. The next phase is called Ongoing Weight Loss (OWL) when each week you add another 5 grams of carbs per day in the form of nutrient-dense foods, such as more vegetables, seeds and nuts, and low-glycemic fruits such as berries. So the first week on OWL, you go from 20 to 25 grams per day; the following week you would move to 30 grams per day and so on. Change the increments on a weekly basis until your weight loss slows to one to two pounds each week. Slowly increasing your carb intake allows your body continue to use its fat stores for fuel.

When you are within five or 10 pounds of your target weight, it is time to move to Pre-Maintenance. You will now be broadening your range of foods while learning what you can eat without regaining weight, adding 10 grams of carbohydrates per day in weekly increments. So long as you continue to lose weight at a slow, almost imperceptible rate, you can begin to add starchy vegetables and whole grains, such as brown rice or whole wheat bread. However, if adding these foods results in cravings or make you gain weight, you should stop eating them immediately.

After you have maintained your weight for four weeks, you will have transitioned to the phase called Lifetime Maintenance, where you are eating a whole-food diet. On rare occasions, you may be able to indulge in cookies, cakes, candies and other junk food, but in general you will continue to avoid products full of sugar and white flour to maintain your weight.