--- a/libpurple/signals.h Thu Dec 17 20:22:55 2020 -0600
+++ b/libpurple/signals.h Thu Dec 17 23:30:40 2020 -0600
@@ -61,7 +61,7 @@
* @cb: The #PurpleCallback to call.
* @args: The arguments to the function.
* @data: Userdata to pass to @cb.
- * @return_val: (optional) (nullable): A return address for a return value.
+ * @return_val: (optional) (out): A return address for a return value. * A generic function pointer type used to register signals.