diff --git a/apps/openstacknode/app/src/main/java/org/onosproject/openstacknode/impl/DefaultOpenstackAuth.java b/apps/openstacknode/app/src/main/java/org/onosproject/openstacknode/impl/DefaultOpenstackAuth.java
index 3257353..5a3b30d 100644
--- a/apps/openstacknode/app/src/main/java/org/onosproject/openstacknode/impl/DefaultOpenstackAuth.java
+++ b/apps/openstacknode/app/src/main/java/org/onosproject/openstacknode/impl/DefaultOpenstackAuth.java
@@ -22,6 +22,9 @@
 
 import static com.google.common.base.Preconditions.checkArgument;
 
+/**
+ * Implementation class of openstack authentication.
+ */
 public class DefaultOpenstackAuth implements OpenstackAuth {
 
     private final String version;