Expander: Explain how to conditionally style arrow

diff --git a/gtk/gtkexpander.c b/gtk/gtkexpander.c
index 609899d84cd6a5c9fa4838210dcec91e45054cf3..894a34a64860c8d3ea2d070988ad3d7099d17687 100644 (file)
--- a/gtk/gtkexpander.c
+++ b/gtk/gtkexpander.c
@@ -99,8 +99,8 @@
  * ]|
  *
  * GtkExpander has three CSS nodes, the main node with the name expander,
- * a subnode with name title and node below it with name arrow. Neither of
- * them is using any style classes.
+ * a subnode with name title and node below it with name arrow. The arrow of an
+ * expander that is showing its child gets the :checked pseudoclass added to it.
  */
 
 #include "config.h"