diff --git a/gtk/gtkbuildable.h b/gtk/gtkbuildable.h
index 78791abbc3..e082706df1 100644
--- a/gtk/gtkbuildable.h
+++ b/gtk/gtkbuildable.h
@@ -38,6 +38,12 @@ typedef struct _GtkBuildableIface GtkBuildableIface;
 typedef struct _GtkBuildableParseContext      GtkBuildableParseContext;
 typedef struct _GtkBuildableParser GtkBuildableParser;
 
+/**
+ * GtkBuildableParseContext:
+ *
+ * An opaque context struct for `GtkBuildableParser`.
+ */
+
 /**
  * GtkBuildableParser:
  * @start_element: function called for open elements