The function gtk_label_set_attributes() is also used to
unset attributes, by passing %NULL. Reflect that in the
argument annotations.
/**
* gtk_label_set_attributes:
* @label: a #GtkLabel
- * @attrs: a #PangoAttrList
- *
+ * @attrs: (allow-none): a #PangoAttrList, or %NULL
+ *
* Sets a #PangoAttrList; the attributes in the list are applied to the
- * label text.
+ * label text.
*
* The attributes set with this function will be applied
* and merged with any other attributes previously effected by way