headerbar: Add example image

diff --git a/gtk/gtkheaderbar.c b/gtk/gtkheaderbar.c
index efa0df9b0ec66b252ffd0b3e8337efbba0fc33c0..547013f3437e1fa762d9db96ea140a0997fb0f39 100644 (file)
--- a/gtk/gtkheaderbar.c
+++ b/gtk/gtkheaderbar.c
@@ -42,6 +42,8 @@
  *
  * `GtkHeaderBar` is a widget for creating custom title bars for windows.
  *
+ * ![An example GtkHeaderBar](headerbar.png)
+ *
  * `GtkHeaderBar` is similar to a horizontal `GtkCenterBox`. It allows
  * children to be placed at the start or the end. In addition, it allows
  * the window title to be displayed. The title will be centered with respect