diff --git a/CHANGELOG b/CHANGELOG
index 9205b897e2..aae718270d 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,4 @@
+* Add the multi selection widget
 * Add index to one2many's on_change
 * Remove auto-refresh on Action Window
 * Add support of domain for non-relation field
diff --git a/trytond/ir/ui/form.rnc b/trytond/ir/ui/form.rnc
index 03c23fc373..5943d85932 100644
--- a/trytond/ir/ui/form.rnc
+++ b/trytond/ir/ui/form.rnc
@@ -66,6 +66,7 @@ attlist.field &=
     | "one2one"
     | "richtext"
     | "dict"
+    | "multiselection"
   }?
 attlist.field &= attribute fill { "0" | "1" }?
 attlist.field &= attribute yexpand { "0" | "1" }?
diff --git a/trytond/ir/ui/form.rng b/trytond/ir/ui/form.rng
index 306de5ef0d..87b446cac2 100644
--- a/trytond/ir/ui/form.rng
+++ b/trytond/ir/ui/form.rng
@@ -165,6 +165,7 @@
           <value>one2one</value>
           <value>richtext</value>
           <value>dict</value>
+          <value>multiselection</value>
         </choice>
       </attribute>
     </optional>