diff --git a/sloth/conf/default_config.py b/sloth/conf/default_config.py
index c90e284..83ce800 100644
--- a/sloth/conf/default_config.py
+++ b/sloth/conf/default_config.py
@@ -15,6 +15,8 @@ INSERTERS = {
 }
 
 CONTAINERS = (
+    ('*.json': 'sloth.annotations.container.JSONContainer'),
+    ('*.yaml': 'sloth.annotations.container.YAMLContainer'),
 )
 
 PLUGINS = (