diff --git a/django/core/cache/backends/memcached.py b/django/core/cache/backends/memcached.py
index 1e4e482b11..7d6b5b362b 100644
--- a/django/core/cache/backends/memcached.py
+++ b/django/core/cache/backends/memcached.py
@@ -7,6 +7,11 @@ from django.utils.encoding import smart_unicode, smart_str
 
 try:
     import cmemcache as memcache
+    import warnings
+    warnings.warn(
+        "Support for the 'cmemcache' library has been deprecated. Please use python-memcached instead.",
+        PendingDeprecationWarning
+    )
 except ImportError:
     try:
         import memcache