diff --git a/adapter-aws-opensearch/src/main/java/io/nosqlbench/adapter/opensearch/OpenSearchSpace.java b/adapter-aws-opensearch/src/main/java/io/nosqlbench/adapter/opensearch/OpenSearchSpace.java
index 52b9933d2d..8303c7a790 100644
--- a/adapter-aws-opensearch/src/main/java/io/nosqlbench/adapter/opensearch/OpenSearchSpace.java
+++ b/adapter-aws-opensearch/src/main/java/io/nosqlbench/adapter/opensearch/OpenSearchSpace.java
@@ -106,6 +106,8 @@ public static NBConfigModel getConfigModel() {
                 .setDescription("The AWS auth profile to use. Required to activate profile based auth"))
             .add(Param.defaultTo("svctype", "es")
                 .setDescription("one of es or aoss, defaults to es for OpenSearch domains"))
+                .add(Param.defaultTo("diag","false")
+                        .setDescription("enable payload diagnostics or not"))
             .asReadOnly();
     }