diff --git a/georiviere/contribution/schema.py b/georiviere/contribution/schema.py
index 6e5197c0..333ba875 100644
--- a/georiviere/contribution/schema.py
+++ b/georiviere/contribution/schema.py
@@ -2,6 +2,7 @@
 
 from . import models
 
+
 # The json schema is summarized on :
 # https://github.com/Georiviere/Georiviere-admin/issues/139
 # Depending on the category and type of the contributions, some fields are available or not.
diff --git a/georiviere/main/apps.py b/georiviere/main/apps.py
index 3cb9f0b9..8e84238c 100644
--- a/georiviere/main/apps.py
+++ b/georiviere/main/apps.py
@@ -15,5 +15,6 @@ def ready(self):
         from georiviere.river.models import Stream
         for model in apps.get_models():
             if issubclass(model, MapEntityMixin) and model != Stream:
+                print("signal for model {}".format(model))
                 post_save.connect(signals.save_objects_generate_distance_to_source, sender=model)
                 post_delete.connect(signals.delete_objects_remove_distance_to_source, sender=model)