ListBox: Update docs of GtkListBoxUpdateHeaderFunc

before is always NULL for the first row.

diff --git a/gtk/gtklistbox.h b/gtk/gtklistbox.h
index 8d425ff244025ab48135d83d137228f9df2d23fa..1ca5ece7d0943d16cd789b2284f1050abe747178 100644 (file)
--- a/gtk/gtklistbox.h
+++ b/gtk/gtklistbox.h
@@ -130,7 +130,7 @@ typedef gint (*GtkListBoxSortFunc) (GtkListBoxRow *row1,
 /**
  * GtkListBoxUpdateHeaderFunc:
  * @row: the row to update
- * @before: the row before @row, or %NULL if it is first
+ * @before: (allow-none): the row before @row, or %NULL if it is first
  * @user_data: (closure): user data
  *
  * Whenever @row changes or which row is before @row changes this