diff --git a/ctapipe_io_magic/__init__.py b/ctapipe_io_magic/__init__.py
index c6e351d644ff15c6b0d2080f5f2619ed5e5d3342..0344d12db3f8bf8d67680f1ac0858f8a75e879b9 100644
--- a/ctapipe_io_magic/__init__.py
+++ b/ctapipe_io_magic/__init__.py
@@ -303,7 +303,7 @@ class MAGICEventSource(EventSource):
                 else:
                     data.mc.energy = event_data['true_energy'] * u.GeV
                     data.mc.alt = (np.pi/2 - event_data['true_zd']) * u.rad
-                    data.mc.az = -1 * (event_data['true_az'] - np.deg2rad(180 - 7)) * u.rad
+                    data.mc.az = -1 * (event_data['true_az'] - np.deg2rad(180 - 7)) * u.rad # check meaning of 7deg transformation (I.Vovk)
                     data.mc.shower_primary_id = 1 - event_data['true_shower_primary_id']
                     data.mc.h_first_int = event_data['true_h_first_int'] * u.cm
                     data.mc.core_x = event_data['true_core_x'] * u.cm
@@ -421,7 +421,7 @@ class MAGICEventSource(EventSource):
                 else:
                     data.mc.energy = event_data['true_energy'] * u.GeV
                     data.mc.alt = (np.pi/2 - event_data['true_zd']) * u.rad
-                    data.mc.az = -1 * (event_data['true_az'] - np.deg2rad(180 - 7)) * u.rad
+                    data.mc.az = -1 * (event_data['true_az'] - np.deg2rad(180 - 7)) * u.rad # check meaning of 7deg transformation (I.Vovk)
                     data.mc.shower_primary_id = 1 - event_data['true_shower_primary_id']
                     data.mc.h_first_int = event_data['true_h_first_int'] * u.cm
                     data.mc.core_x = event_data['true_core_x'] * u.cm