Noted that localmem is the default cache.

docs/topics/cache.txt

@@ -289,11 +289,11 @@ user ``apache``.
 Local-memory caching
 --------------------
 
-If you want the speed advantages of in-memory caching but don't have the
-capability of running Memcached, consider the local-memory cache backend. This
-cache is multi-process and thread-safe. To use it, set
-:setting:`BACKEND <CACHES-BACKEND>` to
-``"django.core.cache.backends.locmem.LocMemCache"``. For example::
+This is the default cache if another is not specified in your settings file. If
+you want the speed advantages of in-memory caching but don't have the capability
+of running Memcached, consider the local-memory cache backend. This cache is
+multi-process and thread-safe. To use it, set :setting:`BACKEND <CACHES-BACKEND>`
+to ``"django.core.cache.backends.locmem.LocMemCache"``. For example::
 
     CACHES = {
         'default': {