Add note to future self on multiplexing synchonization callbacks.
Add note to future self on multiplexing synchonization callbacks.

root-mirror/cling,root-mirror/cling,karies/cling,karies/cling,root-mirror/cling,karies/cling,root-mirror/cling,karies/cling,root-mirror/cling,root-mirror/cling,karies/cling,karies/cling