diff --git a/gtk/gtkcssreferencevalue.c b/gtk/gtkcssreferencevalue.c
index 19092b2ca7..27881cb17d 100644
--- a/gtk/gtkcssreferencevalue.c
+++ b/gtk/gtkcssreferencevalue.c
@@ -224,11 +224,11 @@ parser_error (GtkCssParser         *parser,
 
           if (names[i + 1])
             g_set_error (&new_error,
-                         GTK_CSS_PARSER_ERROR, GTK_CSS_PARSER_ERROR_UNKNOWN_VALUE,
+                         error->domain, error->code,
                          "While expanding %s: %s", names[i + 1], error->message);
           else
             g_set_error_literal (&new_error,
-                                 GTK_CSS_PARSER_ERROR, GTK_CSS_PARSER_ERROR_UNKNOWN_VALUE,
+                                 error->domain, error->code,
                                  error->message);
 
           if (vars[i]->section == NULL)
diff --git a/gtk/gtkdebug.h b/gtk/gtkdebug.h
index 2ca4a999ca..32809c79ba 100644
--- a/gtk/gtkdebug.h
+++ b/gtk/gtkdebug.h
@@ -76,6 +76,13 @@ G_BEGIN_DECLS
  * Since: 4.8
  */
 
+/**
+ * GTK_DEBUG_CSS:
+ *
+ * Information about deprecated CSS features.
+ *
+ * Since: 4.16
+ */
 typedef enum {
   GTK_DEBUG_TEXT            = 1 <<  0,
   GTK_DEBUG_TREE            = 1 <<  1,