diff --git a/gobject/gbinding.c b/gobject/gbinding.c
index 899dc84fd..6872b9662 100644
--- a/gobject/gbinding.c
+++ b/gobject/gbinding.c
@@ -748,7 +748,7 @@ g_binding_get_target_property (GBinding *binding)
 
 /**
  * g_binding_unbind:
- * @binding: a #GBinding
+ * @binding: (transfer full): a #GBinding
  *
  * Explicitly releases the binding between the source and the target
  * property expressed by @binding.