make a note of issue #18 in readme

README.md

@@ -287,10 +287,10 @@ the partition heals.
 The weave container is very light-weight - just over 8MB image size
 and a few 10s of MBs of runtime memory - and disposable. I.e. should
 weave ever run into difficulty, one can simply bounce the weave
-container. Application containers do *not* have to be restarted in
-that event, and indeed may not even experience a temporary
-connectivity failure if the weave container is restarted quickly
-enough.
+container (though note issue #18). Application containers do *not*
+have to be restarted in that event, and indeed may not even experience
+a temporary connectivity failure if the weave container is restarted
+quickly enough.
 
 ## Troubleshooting