diff --git a/utils/trie/lfu-policy.hpp b/utils/trie/lfu-policy.hpp
index 68137ad..6234961 100644
--- a/utils/trie/lfu-policy.hpp
+++ b/utils/trie/lfu-policy.hpp
@@ -20,6 +20,8 @@
 #ifndef LFU_POLICY_H_
 #define LFU_POLICY_H_
 
+/// @cond include_hidden
+
 #include <boost/intrusive/options.hpp>
 #include <boost/intrusive/set.hpp>
 
@@ -158,4 +160,6 @@
 } // ndn
 } // ns3
 
+/// @endcond
+
 #endif // LFU_POLICY_H