A total of 45 patients will be recruited for this study. Patients who have completed a standard six-week rTMS treatment for major depressive disorder will be randomly assigned to one of the three groups: cluster rTMS, taper rTMS, and treatment as usual. Patients in the 'cluster' group will receive two weeks of daily rTMS (10 rTMS sessions) six months after completing their rTMS treatment. Patients in the 'taper' group will receive rTMS immediately after completing rTMS treatment and the frequency of the sessions will be tapered as follows: three sessions a week for two weeks, and then two sessions a week for two weeks. The maintenance plan for patients in 'treatment as usual' group will be decided individually and may include any or all of the following: continue or start on medication, start psychotherapy and/or follow-up visits with psychiatrist or primary care provider.