diff --git a/CHANGES.txt b/CHANGES.txt
index e5633823ea9..a641b01440d 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -526,6 +526,9 @@ Other Changes
     to references to constants in CommonParams.
     (Lars Kotthoff via Otis Gospodnetic)
 
+16. SOLR-520: Deprecated unused LengthFilter since already core in
+    Lucene-Java (hossman)
+
 Build
  1. SOLR-411.  Changed the names of the Solr JARs to use the defacto standard JAR names based on
     project-name-version.jar.  This yields, for example:
diff --git a/src/java/org/apache/solr/analysis/LengthFilter.java b/src/java/org/apache/solr/analysis/LengthFilter.java
index 1a78352d035..41e433698bf 100644
--- a/src/java/org/apache/solr/analysis/LengthFilter.java
+++ b/src/java/org/apache/solr/analysis/LengthFilter.java
@@ -25,7 +25,9 @@ import java.io.IOException;
 
 /**
  * @version $Id$
+ * @deprecated use {@link org.apache.lucene.analysis.LengthFilter}
  */
+@Deprecated
 public final class LengthFilter extends TokenFilter {
   final int min,max;