diff --git a/opensearch-search-quality-evaluation-plugin/src/main/java/org/opensearch/eval/judgments/clickmodel/coec/CoecClickModel.java b/opensearch-search-quality-evaluation-plugin/src/main/java/org/opensearch/eval/judgments/clickmodel/coec/CoecClickModel.java
index 0a1193d..ba1a616 100644
--- a/opensearch-search-quality-evaluation-plugin/src/main/java/org/opensearch/eval/judgments/clickmodel/coec/CoecClickModel.java
+++ b/opensearch-search-quality-evaluation-plugin/src/main/java/org/opensearch/eval/judgments/clickmodel/coec/CoecClickModel.java
@@ -290,7 +290,7 @@ public Map<Integer, Double> getRankAggregatedClickThrough() throws Exception {
         final QueryBuilder findRangeNumber = QueryBuilders.rangeQuery("event_attributes.position.ordinal").lte(parameters.getMaxRank());
         final QueryBuilder queryBuilder = new BoolQueryBuilder().must(findRangeNumber);
 
-        // Order the aggregations by _id and not by value.
+        // Order the aggregations by key and not by value.
         final BucketOrder bucketOrder = BucketOrder.key(true);
 
         final TermsAggregationBuilder positionsAggregator = AggregationBuilders.terms("By_Position").field("event_attributes.position.ordinal").order(bucketOrder).size(parameters.getMaxRank());