diff --git a/lucene/core/src/java/org/apache/lucene/index/MergePolicyWrapper.java b/lucene/core/src/java/org/apache/lucene/index/MergePolicyWrapper.java
index baddcd0592e..c51cd00d7c6 100644
--- a/lucene/core/src/java/org/apache/lucene/index/MergePolicyWrapper.java
+++ b/lucene/core/src/java/org/apache/lucene/index/MergePolicyWrapper.java
@@ -26,6 +26,7 @@ import java.util.Map;
  */
 public class MergePolicyWrapper extends MergePolicy {
 
+  /** The wrapped {@link MergePolicy}. */
   protected final MergePolicy in;
 
   /**