diff a/src/jdk.security.auth/share/classes/com/sun/security/auth/module/JndiLoginModule.java b/src/jdk.security.auth/share/classes/com/sun/security/auth/module/JndiLoginModule.java
--- a/src/jdk.security.auth/share/classes/com/sun/security/auth/module/JndiLoginModule.java
+++ b/src/jdk.security.auth/share/classes/com/sun/security/auth/module/JndiLoginModule.java
@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
@@ -149,12 +149,20 @@
  * </pre>
  *
  */
 public class JndiLoginModule implements LoginModule {
 
-    /** JNDI Provider */
+    /**
+     * Directory service/path where this module can access the relevent
+     * user information.
+     */
     public final String USER_PROVIDER = "user.provider.url";
+
+    /**
+     * Directory service/path where this module can access the relevent
+     * group information.
+     */
     public final String GROUP_PROVIDER = "group.provider.url";
 
     // configurable options
     private boolean debug = false;
     private boolean strongDebug = false;
