jboner/akka — comment on commit 7b2349c0d9292a90f3ec2aa1605426b5b9c42bec
File: akka-docs/java/untyped-actors.rst line 346
By rkuhn:

the actual stop is always asynchronous, also with ActorSystem, the waiting is only for confirmation that the name is free again. Actually, I think this can be optimized, but better to document as it is.