diff --git a/addons/web/static/src/js/core.js b/addons/web/static/src/js/core.js
index 4495334aa23..45e682d8bdf 100644
--- a/addons/web/static/src/js/core.js
+++ b/addons/web/static/src/js/core.js
@@ -328,12 +328,22 @@ openerp.web.Registry = openerp.web.Class.extend( /** @lends openerp.web.Registry
      * Creates and returns a copy of the current mapping, with the provided
      * mapping argument added in (replacing existing keys if needed)
      *
+     * Parent and child remain linked, a new key in the parent (which is not
+     * overwritten by the child) will appear in the child.
+     *
      * @param {Object} [mapping={}] a mapping of keys to object-paths
      */
-    clone: function (mapping) {
+    extend: function (mapping) {
         var child = new openerp.web.Registry(mapping);
         child.parent = this;
         return child;
+    },
+    /**
+     * @deprecated use Registry#extend
+     */
+    clone: function (mapping) {
+        console.warn('Registry#clone is deprecated, use Registry#extend');
+        return this.extend(mapping);
     }
 });
 
diff --git a/addons/web/static/src/js/view_list_editable.js b/addons/web/static/src/js/view_list_editable.js
index 4f6a1531c7a..3eae086539b 100644
--- a/addons/web/static/src/js/view_list_editable.js
+++ b/addons/web/static/src/js/view_list_editable.js
@@ -386,7 +386,7 @@ openerp.web.list_editable = function (openerp) {
         template: 'ListView.row.frame'
     });
     var form_widgets = openerp.web.form.widgets;
-    openerp.web.list.form.widgets = form_widgets.clone({
+    openerp.web.list.form.widgets = form_widgets.extend({
         'frame': 'openerp.web.list.form.WidgetFrame'
     });
     // All form widgets inherit a problematic behavior from
diff --git a/addons/web/static/src/js/view_page.js b/addons/web/static/src/js/view_page.js
index d5c37419764..8a8148f8cae 100644
--- a/addons/web/static/src/js/view_page.js
+++ b/addons/web/static/src/js/view_page.js
@@ -242,7 +242,7 @@ openerp.web.page = function (openerp) {
             }
         }
     });
-    openerp.web.page.readonly = openerp.web.form.widgets.clone({
+    openerp.web.page.readonly = openerp.web.form.widgets.extend({
         'frame': 'openerp.web.page.WidgetFrameReadonly',
         'char': 'openerp.web.page.FieldCharReadonly',
         'id': 'openerp.web.page.FieldCharReadonly',
diff --git a/addons/web/static/test/registry.js b/addons/web/static/test/registry.js
index 9606dfae456..226b3c00566 100644
--- a/addons/web/static/test/registry.js
+++ b/addons/web/static/test/registry.js
@@ -37,7 +37,7 @@ $(document).ready(function () {
             bar: 'openerp.web.Bar'
         });
 
-        var reg2 = reg.clone({ 'foo': 'openerp.web.Foo2' });
+        var reg2 = reg.extend({ 'foo': 'openerp.web.Foo2' });
         strictEqual(reg.get_object('foo'), openerp.web.Foo);
         strictEqual(reg2.get_object('foo'), openerp.web.Foo2);
     });
@@ -47,7 +47,7 @@ $(document).ready(function () {
             bar: 'openerp.web.Bar'
         });
 
-        var reg2 = reg.clone();
+        var reg2 = reg.extend();
         reg.add('foo2', 'openerp.web.Foo2');
         strictEqual(reg.get_object('foo2'), openerp.web.Foo2);
         strictEqual(reg2.get_object('foo2'), openerp.web.Foo2);