diff --git a/ml-algorithms/src/main/java/org/opensearch/ml/engine/algorithms/remote/ConnectorUtils.java b/ml-algorithms/src/main/java/org/opensearch/ml/engine/algorithms/remote/ConnectorUtils.java
index deb0f8c45d..ab4ed7fd6c 100644
--- a/ml-algorithms/src/main/java/org/opensearch/ml/engine/algorithms/remote/ConnectorUtils.java
+++ b/ml-algorithms/src/main/java/org/opensearch/ml/engine/algorithms/remote/ConnectorUtils.java
@@ -95,6 +95,8 @@ private static RemoteInferenceInputDataSet processTextDocsInput(TextDocsInputDat
             for (String doc : inputDataSet.getDocs()) {
                 if (doc != null) {
                     String gsonString = gson.toJson(doc);
+                    // in 2.9, user will add  " before and after string
+                    // gson.toString(string) will add extra " before after string, so need to remove
                     docs.add(gsonString.substring(1, gsonString.length() - 1));
                 } else {
                     docs.add(null);