diff --git a/gio/gdesktopappinfo.c b/gio/gdesktopappinfo.c
index 77e385aa5..28ef7ec17 100644
--- a/gio/gdesktopappinfo.c
+++ b/gio/gdesktopappinfo.c
@@ -4555,6 +4555,9 @@ g_app_info_get_all (void)
  *
  * #GDesktopAppInfoLookup is an opaque data structure and can only be accessed
  * using the following functions.
+ *
+ * Deprecated: 2.28: The #GDesktopAppInfoLookup interface is deprecated and
+ *    unused by GIO.
  **/
 
 G_GNUC_BEGIN_IGNORE_DEPRECATIONS
@@ -4585,7 +4588,8 @@ g_desktop_app_info_lookup_default_init (GDesktopAppInfoLookupInterface *iface)
  *
  * Returns: (transfer full): #GAppInfo for given @uri_scheme or %NULL on error.
  *
- * Deprecated: The #GDesktopAppInfoLookup interface is deprecated and unused by gio.
+ * Deprecated: 2.28: The #GDesktopAppInfoLookup interface is deprecated and
+ *    unused by GIO.
  */
 GAppInfo *
 g_desktop_app_info_lookup_get_default_for_uri_scheme (GDesktopAppInfoLookup *lookup,
diff --git a/gio/gdesktopappinfo.h b/gio/gdesktopappinfo.h
index 1254038a4..3ba5e2226 100644
--- a/gio/gdesktopappinfo.h
+++ b/gio/gdesktopappinfo.h
@@ -118,6 +118,9 @@ gchar *                 g_desktop_app_info_get_action_name              (GDeskto
  *
  * Extension point for default handler to URI association. See
  * [Extending GIO][extending-gio].
+ *
+ * Deprecated: 2.28: The #GDesktopAppInfoLookup interface is deprecated and
+ *    unused by GIO.
  */
 #define G_DESKTOP_APP_INFO_LOOKUP_EXTENSION_POINT_NAME "gio-desktop-app-info-lookup"