diff --git a/model/ccnx-pit-entry.h b/model/ccnx-pit-entry.h
index 40f33d1..9bf2768 100644
--- a/model/ccnx-pit-entry.h
+++ b/model/ccnx-pit-entry.h
@@ -43,10 +43,12 @@
 class CcnxFace;
 class CcnxNameComponents;
 
+/// @cond include_hidden
 namespace __ccnx_private
 {
 class i_retx {};
 }
+/// @endcond
 
 /**
  * \ingroup ccnx