diff --git a/pinot-common/src/test/java/org/apache/pinot/common/metrics/PinotJMXToPromMetricsTest.java b/pinot-common/src/test/java/org/apache/pinot/common/metrics/PinotJMXToPromMetricsTest.java
index 4241fe6e1bb..4c8e5abc346 100644
--- a/pinot-common/src/test/java/org/apache/pinot/common/metrics/PinotJMXToPromMetricsTest.java
+++ b/pinot-common/src/test/java/org/apache/pinot/common/metrics/PinotJMXToPromMetricsTest.java
@@ -117,6 +117,7 @@ public abstract class PinotJMXToPromMetricsTest {
           LABEL_VAL_RAW_TABLENAME, LABEL_KEY_TABLETYPE, LABEL_VAL_TABLETYPE_REALTIME);
 
   protected HTTPServer startExporter(PinotComponent pinotComponent) {
+    //See: https://github.com/prometheus/jmx_exporter/blob/a3b9443564ff5a78c25fd6566396fda2b7cbf216/jmx_prometheus_javaagent/src/main/java/io/prometheus/jmx/JavaAgent.java#L48
     String args = String.format("%s:%s/%s", 0, CONFIG_DIR, PINOT_COMPONENT_CONFIG_FILE_MAP.get(pinotComponent));
     try {
       JMXExporterConfig config = parseExporterConfig(args, "0.0.0.0");