diff --git a/lib/trino-plugin-toolkit/src/main/java/io/trino/plugin/base/metrics/TDigestHistogram.java b/lib/trino-plugin-toolkit/src/main/java/io/trino/plugin/base/metrics/TDigestHistogram.java
index ef50c12e68f1..adaf5982ce83 100644
--- a/lib/trino-plugin-toolkit/src/main/java/io/trino/plugin/base/metrics/TDigestHistogram.java
+++ b/lib/trino-plugin-toolkit/src/main/java/io/trino/plugin/base/metrics/TDigestHistogram.java
@@ -77,6 +77,8 @@ public long getTotal()
         return (long) digest.getCount();
     }
 
+    // Below are extra properties that make it easy to read and parse serialized distribution
+    // in operator summaries and event listener.
     @JsonProperty
     public synchronized double getMin()
     {