docs: Update documentation and Doxygen documentation generation
diff --git a/utils/ndn-rtt-mean-deviation.h b/utils/ndn-rtt-mean-deviation.h
index 02d8fac..fc48173 100644
--- a/utils/ndn-rtt-mean-deviation.h
+++ b/utils/ndn-rtt-mean-deviation.h
@@ -35,7 +35,7 @@
 namespace ndn {
 
 /**
- * \ingroup ndn
+ * \ingroup ndn-apps
  *
  * \brief The modified version of "Mean--Deviation" RTT estimator, as discussed by Van Jacobson that better suits NDN communication model
  *