MapReduce views with deleted records

The documentations explains well how mapreduce views can incrementally get updated when adding documents, but how they get updated when documents are removed from the bucket ? How is the reduce function called ? Is there an example ?
Thanks

I believe, but don’t know for sure, that there isn’t a programming hook for that. The related ID is deleted from the view when the document is deleted.

Note that the Eventing service can react to deletion of documents.