diff --git a/src/main/java/org/apache/commons/math/stat/regression/GLSMultipleLinearRegression.java b/src/main/java/org/apache/commons/math/stat/regression/GLSMultipleLinearRegression.java
index ea14af928..b2bf10f23 100644
--- a/src/main/java/org/apache/commons/math/stat/regression/GLSMultipleLinearRegression.java
+++ b/src/main/java/org/apache/commons/math/stat/regression/GLSMultipleLinearRegression.java
@@ -123,6 +123,7 @@ public class GLSMultipleLinearRegression extends AbstractMultipleLinearRegressio
      * matrix X.
      *
      * @return error variance
+     * @since 2.2
      */
     @Override
     protected double calculateErrorVariance() {