diff --git a/ndn.cxx/exclude.h b/ndn.cxx/exclude.h
index 8315f34..fcdcbb3 100644
--- a/ndn.cxx/exclude.h
+++ b/ndn.cxx/exclude.h
@@ -19,6 +19,7 @@
 NDN_NAMESPACE_BEGIN
 
 /**
+ * @ingroup ndn-cxx
  * @brief Class to represent Exclude component in NDN interests
  */
 class Exclude : public SimpleRefCount<Exclude>