diff --git a/src/main/java/org/apache/commons/math/stat/StatUtils.java b/src/main/java/org/apache/commons/math/stat/StatUtils.java
index 05f2fcae6..069536f22 100644
--- a/src/main/java/org/apache/commons/math/stat/StatUtils.java
+++ b/src/main/java/org/apache/commons/math/stat/StatUtils.java
@@ -636,6 +636,7 @@ public final class StatUtils {
      *
      * @param sample sample to normalize
      * @return normalized (standardized) sample
+     * @since 2.2
      */
     public static double[] normalize(final double[] sample) {
         DescriptiveStatistics stats = new DescriptiveStatistics();