diff --git a/ndn.cxx/blob.h b/ndn.cxx/blob.h
index 4b488b3..1b1aa2d 100644
--- a/ndn.cxx/blob.h
+++ b/ndn.cxx/blob.h
@@ -20,6 +20,7 @@
 NDN_NAMESPACE_BEGIN
 
 /**
+ * @ingroup ndn-cxx
  * @brief Class representing a general-use binary blob
  */
 class Blob