descriptive comment for the Cleanup function

tail.go

@@ -306,8 +306,9 @@ func (tail *Tail) sendLine(line []byte) bool {
 	return true
 }
 
-// Cleanup removes open inotify watchers, because the Linux kernel does do so
-// upon process exit.
+// Cleanup removes inotify watches added by the tail package. This function is
+// meant to be invoked from a process's exit handler. Linux kernel will not
+// automatically remove inotify watches after the process exits.
 func Cleanup() {
 	watch.Cleanup()
 }