diff --git a/tiramisu/config.py b/tiramisu/config.py
index 5849498..d12cc41 100644
--- a/tiramisu/config.py
+++ b/tiramisu/config.py
@@ -37,6 +37,7 @@ class Config(object):
             '_cfgimpl_parent', '_cfgimpl_warnings', '_cfgimpl_permissive',
             '_cfgimpl_context', '_cfgimpl_settings', '_cfgimpl_values',
             '_cfgimpl_slots', '_cfgimpl_build_all_paths')
+
     def __init__(self, descr, parent=None, context=None, valid_opt_names=True):
         """ Configuration option management master class
 
@@ -70,9 +71,9 @@ class Config(object):
         self._cfgimpl_warnings = []
         if valid_opt_names:
             # some api members shall not be used as option's names !
-            #methods = getmembers(self, ismethod)
-            self._cfgimpl_slots = []  #[key for key, value in methods
-                                  #if not key.startswith("_")]
+            methods = getmembers(self, ismethod)
+            self._cfgimpl_slots = [key for key, value in methods
+                                  if not key.startswith("_")]
         else:
             self._cfgimpl_slots = []
         self._cfgimpl_build()