This is usually not a problem if you have full ROM and it is not painful. It is called crepitus and is fairly normal if non-painful. It could also be a plica clicking if it is on the medial aspect of the knee - this is only a problem if it becomes irritated. Just make sure you have strong LE musculature and work on flexibility (hamstrings, quadriceps, gastroc-soleus, hips) and this should clear up.

keep me updated on how this works out.

Hunter