diff --git a/doc/source/development.rst b/doc/source/development.rst
index 81f2d8219a5..8e37ed744b1 100644
--- a/doc/source/development.rst
+++ b/doc/source/development.rst
@@ -114,7 +114,7 @@ reaction:
 
 The :js:class:`openerp.base.search.Input` type implements registration
 on its own, but its implementations of ``get_context`` and
-``get_domain`` simply raise errors and *have* to be overridden.
+``get_domain`` simply raise errors and *must* be overridden.
 
 One last action is for filters, as an activation order has to be kept
 on them for some controls (establish the correct grouping sequence for