diff --git a/odoo/addons/base/models/assetsbundle.py b/odoo/addons/base/models/assetsbundle.py
index 4ce7b682d71..6f5d85bc9f4 100644
--- a/odoo/addons/base/models/assetsbundle.py
+++ b/odoo/addons/base/models/assetsbundle.py
@@ -197,6 +197,7 @@ class AssetsBundle(object):
         # avoid to invalidate cache if it's already empty (mainly useful for test)
 
         if attachments:
+            _logger.info('Deleting attachments %s (matching %s) because it was replaced with %s', attachments.ids, to_clean_pattern, keep_url)
             self._unlink_attachments(attachments)
             # clear_cache was removed
 
@@ -306,6 +307,8 @@ class AssetsBundle(object):
         }
         attachment = ira.with_user(SUPERUSER_ID).create(values)
 
+        _logger.info('Generating a new asset bundle attachment %s (id:%s)', attachment.url, attachment.id)
+
         self._clean_attachments(extension, url)
 
         # For end-user assets (common and backend), send a message on the bus