diff --git a/docs/reference/gtk/gtk3-sections.txt b/docs/reference/gtk/gtk3-sections.txt
index e94fd77b37..dfba4d3564 100644
--- a/docs/reference/gtk/gtk3-sections.txt
+++ b/docs/reference/gtk/gtk3-sections.txt
@@ -5528,6 +5528,7 @@ GTK_STYLE_CLASS_MENUITEM
 GTK_STYLE_CLASS_PROGRESSBAR
 GTK_STYLE_CLASS_SPINNER
 GTK_STYLE_CLASS_TOOLBAR
+GTK_STYLE_CLASS_PANE_SEPARATOR
 GTK_STYLE_CLASS_DND
 GTK_STYLE_CLASS_ERROR
 GTK_STYLE_CLASS_EXPANDER
@@ -5541,6 +5542,8 @@ GTK_STYLE_CLASS_SCALE
 GTK_STYLE_CLASS_SPINBUTTON
 GTK_STYLE_CLASS_VIEW
 GTK_STYLE_CLASS_WARNING
+GTK_STYLE_CLASS_HORIZONTAL
+GTK_STYLE_CLASS_VERTICAL
 GTK_STYLE_REGION_COLUMN
 GTK_STYLE_REGION_COLUMN_HEADER
 GTK_STYLE_REGION_ROW