Why use phenolphthalein as an indicator for a strong acid & strong base?

We were doing titrations today and my prac demonstrator said to use phenolphthalein to titrate NaOH (in the burette) and HCl (in the flask) we then calculated the concentration of HCl. However I have always been told to use indicators with around a 7.0 colour change point for strong acids and strong bases. How come we were told to use phenolphthalein which is generally used for a strong base, weak acid titration?