diff --git a/oslo_cache/backends/memcache_pool.py b/oslo_cache/backends/memcache_pool.py
index e07d6fa6..449d48f9 100644
--- a/oslo_cache/backends/memcache_pool.py
+++ b/oslo_cache/backends/memcache_pool.py
@@ -36,7 +36,21 @@ class ClientProxy(object):
 
 
 class PooledMemcachedBackend(memcached_backend.MemcachedBackend):
-    """Memcached backend that does connection pooling."""
+    """Memcached backend that does connection pooling.
+
+    This memcached backend only allows for reuse of a client object,
+    prevents too many client object from being instantiated, and maintains
+    proper tracking of dead servers so as to limit delays when a server
+    (or all servers) become unavailable.
+
+    This backend doesn't allow to load balance things between servers.
+
+    Memcached isn't HA. Values aren't automatically replicated between servers
+    unless the client went out and wrote the value multiple time.
+
+    The memcache server to use is determined by `python-memcached` itself by
+    picking the host to use (from the given server list) based on a key hash.
+    """
 
     # Composed from GenericMemcachedBackend's and MemcacheArgs's __init__
     def __init__(self, arguments):