diff --git a/core/src/main/java/hudson/matrix/MatrixConfigurationSorterDescriptor.java b/core/src/main/java/hudson/matrix/MatrixConfigurationSorterDescriptor.java
index ff09dd01f585f55126a8c9b2deb0c63de9d7453a..10be2924bd1377292c8a2981c9859d1c750a587f 100644
--- a/core/src/main/java/hudson/matrix/MatrixConfigurationSorterDescriptor.java
+++ b/core/src/main/java/hudson/matrix/MatrixConfigurationSorterDescriptor.java
@@ -5,7 +5,10 @@ import hudson.model.Descriptor;
 import jenkins.model.Jenkins;
 
 /**
+ * Descriptor for {@link MatrixConfigurationSorter}.
+ *
  * @author Kohsuke Kawaguchi
+ * @since 1.439
  */
 public abstract class MatrixConfigurationSorterDescriptor extends Descriptor<MatrixConfigurationSorter> {
     protected MatrixConfigurationSorterDescriptor(Class<? extends MatrixConfigurationSorter> clazz) {