Clarify comment for tick function
@@ -246,7 +246,7 @@ func (mgr *ttlmanager) stop() {
<-mgr.done
}
-// For internal use only
+// To be called by TTL manager's coroutine only.
func (mgr *ttlmanager) tick() {
mgr.RLock()
defer mgr.RUnlock()
