anchor.diff:  <3> Write of the result of the read.
   <4> What triggered this event.
   
  -===== *13. Excerpt indexing in Chronicle Queue*
  +* *13. Excerpt indexing in Chronicle Queue*
  +
   //An index is assigned to the excerpt that is written into a queue.
   In the following section you will find how to work with the excerpt index.
   
  -- *Finding the index at the end of a Chronicle Queue*
  +** *13.1. Finding the index at the end of a Chronicle Queue*
   
   Chronicle Queue appenders are thread-local.
   In fact when you ask for:
  
positive.code: 
  *-* `queue`: The queue that this Pretoucher is assigned to.
  
  - *Pretoucher usage example*
  
  The configuration parameters of Pretoucher that were described above should be set via system properties. For example, in the following excerpt `earlyAcquireNextCycle` is set to `true` and `pretoucherPrerollTimeMs` to 100ms.
  [source,java]
  
negative.code: }
  ----
  
  * *14. File retention*
  
  You can add a `StoreFileListener` to notify you when a file is added, or no longer used.
  This can be used to delete files after a period of time.
  