diff --git a/doc/install-guide/source/environment-memcached.rst b/doc/install-guide/source/environment-memcached.rst
index cb7e6c990c..3ddde088c1 100644
--- a/doc/install-guide/source/environment-memcached.rst
+++ b/doc/install-guide/source/environment-memcached.rst
@@ -2,8 +2,9 @@ Memcached
 ~~~~~~~~~
 
 The Identity service authentication mechanism for services uses Memcached
-to cache tokens. For production deployments, we recommend enabling a
-combination of firewalling, authentication, and encryption to secure it.
+to cache tokens. The memcached service typically runs on the controller
+node. For production deployments, we recommend enabling a combination of
+firewalling, authentication, and encryption to secure it.
 
 Install and configure components
 --------------------------------