diff --git a/modules/analysis/common/src/java/org/apache/lucene/analysis/pt/PortugueseLightStemmer.java b/modules/analysis/common/src/java/org/apache/lucene/analysis/pt/PortugueseLightStemmer.java
index 1baea680c0b..367cb713251 100644
--- a/modules/analysis/common/src/java/org/apache/lucene/analysis/pt/PortugueseLightStemmer.java
+++ b/modules/analysis/common/src/java/org/apache/lucene/analysis/pt/PortugueseLightStemmer.java
@@ -56,6 +56,10 @@ import static org.apache.lucene.analysis.util.StemmerUtil.*;
 
 /**
  * Light Stemmer for Portuguese
+ * <p>
+ * This stemmer implements the "UniNE" algorithm in:
+ * <i>Light Stemming Approaches for the French, Portuguese, German and Hungarian Languages</i>
+ * Jacques Savoy
  */
 public class PortugueseLightStemmer {