level bar: Document buildable syntax

diff --git a/gtk/gtklevelbar.c b/gtk/gtklevelbar.c
index aed59201b411470cb758b6e654533e09c4dc823f..46684cd6a8744f5e2616700a4591487638dc185d 100644 (file)
--- a/gtk/gtklevelbar.c
+++ b/gtk/gtklevelbar.c
@@ -87,7 +87,13 @@
  * set the minimum value to 0 and the maximum value to 5 after changing the indicator
  * mode to discrete.
  *
- * Since: 3.6
+ * GtkLevelBar was introduced in GTK+ 3.6.
+ *
+ * # GtkLevelBar as GtkBuildable
+ *
+ * The GtkLevelBar implementation of the GtkBuildable interface supports a
+ * custom <offsets> element, which can contain any number of <offset> elements,
+ * each of which must have name and value attributes.
  *
  * # CSS nodes
  *