diff --git a/src/main/java/ch/psi/daq/queryrest/response/json/JSONTableResponseStreamWriter.java b/src/main/java/ch/psi/daq/queryrest/response/json/JSONTableResponseStreamWriter.java
index dfa2cd2..592d3a8 100644
--- a/src/main/java/ch/psi/daq/queryrest/response/json/JSONTableResponseStreamWriter.java
+++ b/src/main/java/ch/psi/daq/queryrest/response/json/JSONTableResponseStreamWriter.java
@@ -118,6 +118,7 @@ public class JSONTableResponseStreamWriter implements ResponseStreamWriter {
                   /* make sure identifiers are available */
                   includedFields.add(QueryField.channel.name());
                   includedFields.add(QueryField.backend.name());
+                  // issue ATEST-633
                   if (!containsAggregation(includedFields)) {
                      includedFields.addAll(defaultResponseAggregationsStr);
                   }