Expander: Explain how to conditionally style arrow

diff --git a/gtk/gtkexpander.c b/gtk/gtkexpander.c
index e1f361760b1bdd3110d831d15c8f28e03673a6fa..bf29555f919f7ad0e6f0145d7c3be53a07e2a8e2 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"