diff --git a/brozzler/__init__.py b/brozzler/__init__.py
index 3be20f2..8a96c8b 100644
--- a/brozzler/__init__.py
+++ b/brozzler/__init__.py
@@ -94,17 +94,19 @@ def _logging_handler_handle(self, record):
 logging.Handler.handle = _logging_handler_handle
 
 _behaviors = None
-def behaviors(behaviors_dir=None):
+def behaviors(behaviors_dir=None, conf='behaviors.yaml'):
     """Return list of JS behaviors loaded from YAML file.
 
     :param behaviors_dir: Directory containing `behaviors.yaml` and
     `js-templates/`. Defaults to brozzler dir.
+    :param conf: The YAML definition of behaviors, it could also be
+    `login-behaviors.yaml` to load login action behaviors.
     """
     import os, yaml, string
     global _behaviors
     if _behaviors is None:
         d = behaviors_dir or os.path.dirname(__file__)
-        behaviors_yaml = os.path.join(d, 'behaviors.yaml')
+        behaviors_yaml = os.path.join(d, conf)
         with open(behaviors_yaml) as fin:
             _behaviors = yaml.safe_load(fin)
     return _behaviors