diff --git a/inventory/sample/group_vars/all.yml b/inventory/sample/group_vars/all.yml
index e8d5395b1..c107b049f 100644
--- a/inventory/sample/group_vars/all.yml
+++ b/inventory/sample/group_vars/all.yml
@@ -128,5 +128,9 @@ bin_dir: /usr/local/bin
 ## Set level of detail for etcd exported metrics, specify 'extensive' to include histogram metrics.
 #etcd_metrics: basic
 
+## Etcd is restricted by default to 512M on systems under 4GB RAM, 512MB is not enough for much more than testing.
+## Set this if your etcd nodes have less than 4GB but you want more RAM for etcd. Set to 0 for unrestricted RAM.
+#etcd_memory_limit: "512M"
+
 # The read-only port for the Kubelet to serve on with no authentication/authorization. Uncomment to enable.
 #kube_read_only_port: 10255