diff -r 26c02bd94bd9 -r b4ff7392003a tuikit/layouts/layout.py
--- a/tuikit/layouts/layout.py	Sun Feb 15 12:48:23 2015 +0100
+++ b/tuikit/layouts/layout.py	Sun Feb 15 12:52:46 2015 +0100
@@ -3,10 +3,15 @@
     def __init__(self):
         self._managed_widgets = []
 
-    def add(self, widget):
+    def add(self, widget, **_kwargs):
         self._managed_widgets.append(widget)
 
-    def update(self):
-        """Rearrange managed widgets."""
+    def update(self, w, h):
+        """Rearrange managed widgets in given space.
+
+        `w`, `h` is available horizontal and vertical space,
+        or width and height of parent container of managed widgets.
+
+        """
         pass