diff --git a/tiramisu/option.py b/tiramisu/option.py
index 79ef025..41ab171 100644
--- a/tiramisu/option.py
+++ b/tiramisu/option.py
@@ -91,8 +91,7 @@ class Multi(list):
             if master == multi.opt._name:
                 if add_master:
                     multi._setvalue(value, who=settings.get_owner())
-            elif len(multi) == 0 \
-                 or len(multi) < len(self):
+            elif len(multi) == 0 or len(multi) < len(self):
                 multi._append_default()
 
     def _append_default(self):
@@ -614,10 +613,10 @@ def validate_requires_arg(requires, name):
         action = req[2]
         if action not in available_actions:
             raise RequiresError("malformed requirements for option: {0}"
-                                "unknown action: {1}".format(name, action))
+                                " unknown action: {1}".format(name, action))
         if reverse_actions[action] in config_action:
             raise RequiresError("inconsistency in action types for option: {0}"
-                                "action: {1} in contradiction with {2}\n"
+                                " action: {1} in contradiction with {2}\n"
                                 " ({3})".format(name, action,
                                     reverse_actions[action], requires))
         config_action.append(action)