diff --git a/openerp/addons/base/rng/view.rng b/openerp/addons/base/rng/view.rng
index 7cbe7135106..4769f961288 100644
--- a/openerp/addons/base/rng/view.rng
+++ b/openerp/addons/base/rng/view.rng
@@ -537,6 +537,10 @@
             <rng:optional><rng:attribute name="filters"/></rng:optional>
             <rng:optional><rng:attribute name="statusbar_visible"/></rng:optional>
             <rng:optional><rng:attribute name="statusbar_colors"/></rng:optional>
+            <!-- Widget *static* options defined as an arbitrary JSON dict, with
+                 widget-dependent parameters. To be ignored if widget/client does
+                 not support them. -->
+            <rng:optional><rng:attribute name="options"/></rng:optional>
             <rng:zeroOrMore>
                 <rng:choice>
                     <rng:ref name="diagram"/>