diff --git a/glib/gvarianttypeinfo.c b/glib/gvarianttypeinfo.c
index 399b610c8..71f59edd6 100644
--- a/glib/gvarianttypeinfo.c
+++ b/glib/gvarianttypeinfo.c
@@ -220,8 +220,8 @@ g_variant_type_info_get_type_string (GVariantTypeInfo *info)
 /* < private >
  * g_variant_type_info_query:
  * @info: a #GVariantTypeInfo
- * @alignment: (nullable): the location to store the alignment, or %NULL
- * @fixed_size: (nullable): the location to store the fixed size, or %NULL
+ * @alignment: (optional): the location to store the alignment, or %NULL
+ * @fixed_size: (optional): the location to store the fixed size, or %NULL
  *
  * Queries @info to determine the alignment requirements and fixed size
  * (if any) of the type.
@@ -329,8 +329,8 @@ g_variant_type_info_element (GVariantTypeInfo *info)
 /* < private >
  * g_variant_type_query_element:
  * @info: a #GVariantTypeInfo for an array or maybe type
- * @alignment: (nullable): the location to store the alignment, or %NULL
- * @fixed_size: (nullable): the location to store the fixed size, or %NULL
+ * @alignment: (optional): the location to store the alignment, or %NULL
+ * @fixed_size: (optional): the location to store the fixed size, or %NULL
  *
  * Returns the alignment requires and fixed size (if any) for the
  * element type of the array.  This call is a convenience wrapper around