diff --git a/model/cs/content-store-with-freshness.h b/model/cs/content-store-with-freshness.h
index 22242b9..d9fa1ba 100644
--- a/model/cs/content-store-with-freshness.h
+++ b/model/cs/content-store-with-freshness.h
@@ -30,6 +30,10 @@
 namespace ndn {
 namespace cs {
 
+/**
+ * @ingroup ndn-cs
+ * @brief Special content store realization that honors Freshness parameter in Data packets
+ */
 template<class Policy>
 class ContentStoreWithFreshness :
     public ContentStoreImpl< ndnSIM::multi_policy_traits< boost::mpl::vector2< Policy, ndnSIM::freshness_policy_traits > > >