diff --git a/gdk/gdksurface.c b/gdk/gdksurface.c
index 5fcb20de9a..104bc719d2 100644
--- a/gdk/gdksurface.c
+++ b/gdk/gdksurface.c
@@ -578,7 +578,7 @@ gdk_surface_class_init (GdkSurfaceClass *klass)
   /**
    * GdkSurface::event:
    * @surface: the #GdkSurface
-   * @event: an input event
+   * @event: (type Gdk.Event): an input event
    *
    * Emitted when GDK receives an input event for @surface.
    *