+ The intent of flush_all with a delay, was that in a setting where you
+ have a pool of memcached servers, and you need to flush all content,
+ you have the option of not resetting all memcached servers at the
+ same time (which could e.g. cause a spike in database load with all
+ clients suddenly needing to recreate content that would otherwise
+ have been found in the memcached daemon).
+
+.. _memcached protocol documentation: https://github.com/memcached/memcached/blob/master/doc/protocol.txt
+
+ENVIRONMENT
+-----------
+
+.. envvar:: MEMCACHED_SERVERS
+
+ Specify the list of servers.