diff --git a/gir/gio-2.0.c b/gir/gio-2.0.c
index 2c3fe482..a0228339 100644
--- a/gir/gio-2.0.c
+++ b/gir/gio-2.0.c
@@ -18520,7 +18520,7 @@
  * g_dbus_proxy_call:
  * @proxy: A #GDBusProxy.
  * @method_name: Name of method to invoke.
- * @parameters: A #GVariant tuple with parameters for the signal or %NULL if not passing parameters.
+ * @parameters: (allow-none): A #GVariant tuple with parameters for the signal or %NULL if not passing parameters.
  * @flags: Flags from the #GDBusCallFlags enumeration.
  * @timeout_msec: The timeout in milliseconds (with %G_MAXINT meaning "infinite") or -1 to use the proxy default timeout.
  * @cancellable: A #GCancellable or %NULL.
@@ -18579,7 +18579,7 @@
  * g_dbus_proxy_call_sync:
  * @proxy: A #GDBusProxy.
  * @method_name: Name of method to invoke.
- * @parameters: A #GVariant tuple with parameters for the signal or %NULL if not passing parameters.
+ * @parameters: (allow-none): A #GVariant tuple with parameters for the signal or %NULL if not passing parameters.
  * @flags: Flags from the #GDBusCallFlags enumeration.
  * @timeout_msec: The timeout in milliseconds (with %G_MAXINT meaning "infinite") or -1 to use the proxy default timeout.
  * @cancellable: A #GCancellable or %NULL.
@@ -18748,8 +18748,8 @@
  * g_dbus_proxy_new:
  * @connection: A #GDBusConnection.
  * @flags: Flags used when constructing the proxy.
- * @info: A #GDBusInterfaceInfo specifying the minimal interface that @proxy conforms to or %NULL.
- * @name: A bus name (well-known or unique) or %NULL if @connection is not a message bus connection.
+ * @info: (allow-none): A #GDBusInterfaceInfo specifying the minimal interface that @proxy conforms to or %NULL.
+ * @name: (allow-none): A bus name (well-known or unique) or %NULL if @connection is not a message bus connection.
  * @object_path: An object path.
  * @interface_name: A D-Bus interface name.
  * @cancellable: A #GCancellable or %NULL.
@@ -18795,7 +18795,7 @@
  * g_dbus_proxy_new_for_bus:
  * @bus_type: A #GBusType.
  * @flags: Flags used when constructing the proxy.
- * @info: A #GDBusInterfaceInfo specifying the minimal interface that @proxy conforms to or %NULL.
+ * @info: (allow-none): A #GDBusInterfaceInfo specifying the minimal interface that @proxy conforms to or %NULL.
  * @name: A bus name (well-known or unique).
  * @object_path: An object path.
  * @interface_name: A D-Bus interface name.
@@ -18826,7 +18826,7 @@
  * g_dbus_proxy_new_for_bus_sync:
  * @bus_type: A #GBusType.
  * @flags: Flags used when constructing the proxy.
- * @info: A #GDBusInterfaceInfo specifying the minimal interface that @proxy conforms to or %NULL.
+ * @info: (allow-none): A #GDBusInterfaceInfo specifying the minimal interface that @proxy conforms to or %NULL.
  * @name: A bus name (well-known or unique).
  * @object_path: An object path.
  * @interface_name: A D-Bus interface name.
@@ -18876,7 +18876,7 @@
  * g_dbus_proxy_set_cached_property:
  * @proxy: A #GDBusProxy
  * @property_name: Property name.
- * @value: Value for the property or %NULL to remove it from the cache.
+ * @value: (allow-none): Value for the property or %NULL to remove it from the cache.
  *
  * If @value is not %NULL, sets the cached value for the property with
  * name @property_name to the value in @value.
@@ -18929,7 +18929,7 @@
 /**
  * g_dbus_proxy_set_interface_info:
  * @proxy: A #GDBusProxy
- * @info: Minimum interface this proxy conforms to or %NULL to unset.
+ * @info: (allow-none): Minimum interface this proxy conforms to or %NULL to unset.
  *
  * Ensure that interactions with @proxy conform to the given
  * interface.  For example, when completing a method call, if the type