diff --git a/src/main/java/org/elasticsearch/search/aggregations/metrics/percentiles/tdigest/TDigestState.java b/src/main/java/org/elasticsearch/search/aggregations/metrics/percentiles/tdigest/TDigestState.java
index 3bf2771bd6d..3eeb56ae921 100644
--- a/src/main/java/org/elasticsearch/search/aggregations/metrics/percentiles/tdigest/TDigestState.java
+++ b/src/main/java/org/elasticsearch/search/aggregations/metrics/percentiles/tdigest/TDigestState.java
@@ -25,7 +25,7 @@ import org.elasticsearch.common.io.stream.StreamOutput;
 import java.io.IOException;
 
 /**
- * Extension of {@link TDigest} with custom serialization.
+ * Extension of {@link com.tdunning.math.stats.TDigest} with custom serialization.
  */
 public class TDigestState extends AVLTreeDigest {