diff --git a/etc/l3_agent.ini b/etc/l3_agent.ini
index 1e6ad199d7a..7be4853b42e 100644
--- a/etc/l3_agent.ini
+++ b/etc/l3_agent.ini
@@ -28,6 +28,10 @@ root_helper = sudo
 
 # If use_namespaces is set as False then the agent can only configure one router.
 
+# Where to store Quantum state files.  This directory must be writable by the
+# user executing the agent.
+# state_path = /var/lib/quantum
+
 # This is done by setting the specific router_id.
 # router_id =