diff --git a/docs/modules/zookeeper/pages/usage_guide/resource_configuration.adoc b/docs/modules/zookeeper/pages/usage_guide/resource_configuration.adoc
index 4ccde3a2..ee6018b7 100644
--- a/docs/modules/zookeeper/pages/usage_guide/resource_configuration.adoc
+++ b/docs/modules/zookeeper/pages/usage_guide/resource_configuration.adoc
@@ -51,3 +51,5 @@ servers:
             data:
               capacity: '1Gi'
 ----
+
+ZooKeeper's JVM heap size is set automatically to 80% of the configured `memory.limit`.