diff --git a/gobject/gparam.h b/gobject/gparam.h
index 7584d5da4..e496d1d46 100644
--- a/gobject/gparam.h
+++ b/gobject/gparam.h
@@ -267,6 +267,8 @@ struct _GParamSpecClass
  * 
  * The GParameter struct is an auxiliary structure used
  * to hand parameter name/value pairs to g_object_newv().
+ *
+ * Deprecated: 2.52: This type is not introspectable.
  */
 struct _GParameter /* auxiliary structure for _setv() variants */
 {