diff --git a/sncfgtfs/management/commands/update_sncf_gtfs.py b/sncfgtfs/management/commands/update_sncf_gtfs.py
index 7adee86..aecfc21 100644
--- a/sncfgtfs/management/commands/update_sncf_gtfs.py
+++ b/sncfgtfs/management/commands/update_sncf_gtfs.py
@@ -24,6 +24,7 @@ class Command(BaseCommand):
     }
 
     def add_arguments(self, parser):
+        parser.add_argument('--debug', '-d', action='store_true', help="Activate debug mode")
         parser.add_argument('--bulk_size', type=int, default=1000, help="Number of objects to create in bulk.")
         parser.add_argument('--dry-run', action='store_true',
                             help="Do not update the database, only print what would be done.")
diff --git a/sncfgtfs/management/commands/update_sncf_gtfs_rt.py b/sncfgtfs/management/commands/update_sncf_gtfs_rt.py
index 24d2f79..f78c35f 100644
--- a/sncfgtfs/management/commands/update_sncf_gtfs_rt.py
+++ b/sncfgtfs/management/commands/update_sncf_gtfs_rt.py
@@ -22,9 +22,9 @@ class Command(BaseCommand):
     }
 
     def add_arguments(self, parser):
-        pass
+        parser.add_argument('--debug', '-d', action='store_true', help="Activate debug mode")
 
-    def handle(self, *args, **options):
+    def handle(self, debug=False, *args, **options):
         for feed_type, feed_url in self.GTFS_RT_FEEDS.items():
             self.stdout.write(f"Updating {feed_type} feed...")
             feed_message = FeedMessage()
@@ -32,6 +32,10 @@ class Command(BaseCommand):
 
             stop_times_updates = []
 
+            if debug:
+                with open(f'feed_message-{feed_type}.txt', 'w') as f:
+                    f.write(str(feed_message))
+
             for entity in feed_message.entity:
                 if entity.HasField("trip_update"):
                     trip_update = entity.trip_update