Add comment to clarify the reason why there is no explicit 'assert' test at the end.

test/160_claim_3_test.sh

@@ -32,6 +32,7 @@ stop_router_on $HOST1
 stop_router_on $HOST2
 
 # Now make host1 attempt to claim from host2, when host2 is stopped
+# the point being to check whether host1 will hang trying to talk to host2
 weave_on $HOST2 launch-router
 # Introduce host3 to remember the IPAM CRDT when we stop host2
 weave_on $HOST3 launch-router $HOST2