diff --git a/openerp/addons/base/ir/ir.xml b/openerp/addons/base/ir/ir.xml
index d4c620dcf56..c1ad6722bb8 100644
--- a/openerp/addons/base/ir/ir.xml
+++ b/openerp/addons/base/ir/ir.xml
@@ -28,7 +28,7 @@
                     <group col="2" colspan="2">
                         <separator string="Values for Event Type" colspan="2"/>
                         <label string="client_action_multi, client_action_relate" colspan="2"/>
-                        <label string="tree_but_action, client_print_multi"  colspan="2"/>
+                        <label string="tree_but_open, client_print_multi"  colspan="2"/>
                     </group>
                     <group col="2" colspan="2">
                         <separator colspan="2" string="Value"/>
diff --git a/openerp/addons/base/ir/ir_values.py b/openerp/addons/base/ir/ir_values.py
index c2a59ada55e..f079e5764c9 100644
--- a/openerp/addons/base/ir/ir_values.py
+++ b/openerp/addons/base/ir/ir_values.py
@@ -79,7 +79,10 @@ class ir_values(osv.osv):
             method=True, type='text', string='Value'),
         'object': fields.boolean('Is Object'),
         'key': fields.selection([('action','Action'),('default','Default')], 'Type', size=128, select=True),
-        'key2' : fields.char('Event Type',help="The kind of action or button in the client side that will trigger the action.", size=128, select=True),
+        'key2' : fields.char('Event Type', size=128, select=True, help="The kind of action or button on the client side "
+                                                                       "that will trigger the action. One of: "
+                                                                       "client_action_multi, client_action_relate, tree_but_open, "
+                                                                       "client_print_multi"),
         'meta': fields.text('Meta Datas'),
         'meta_unpickle': fields.function(_value_unpickle, fnct_inv=_value_pickle,
             method=True, type='text', string='Metadata'),