diff --git a/tpl/macro.twig b/tpl/macro.twig
index 4b1ff80..078adf5 100644
--- a/tpl/macro.twig
+++ b/tpl/macro.twig
@@ -92,7 +92,9 @@ func (self *{{o.name}}) WriteFields(writer meta.Writer) error {
   return nil
 }
 
-%ext_methods%
+{% if has_token(o, 'bitfields') %}
+{{_self.bitfields_methods(o)}}
+{% endif %}
 
 {% if has_token(o, 'statist') %}
 {{_self.stats_methods(meta, o)}}
@@ -212,6 +214,24 @@ self.fieldsMask = meta.FieldsMask{}
 
 {% endmacro %}
 
+{% macro bitfields_methods(o) %}
+func(self *{{o.name}}) HasValue(index uint64) bool {
+  return self.fieldsMask.FieldChanged(index)
+}
+
+func(self *{{o.name}}) SetFieldChanged(index uint64) {
+  self.fieldsMask.SetFieldChanged(index)
+}
+
+func(self *{{o.name}}) IsMaskFilled() bool {
+  return self.fieldsMask.IsFilled()
+}
+
+func(self *{{o.name}}) GetMask() meta.FieldsMask {
+  return self.fieldsMask
+}
+{% endmacro %}
+
 {% macro stats_methods(meta, o) %}
 
 func (self *{{o.name}}) Table() string {