diff --git a/rmw_connextdds_common/include/rmw_connextdds/context.hpp b/rmw_connextdds_common/include/rmw_connextdds/context.hpp
index 925ccf8f..3cc22bef 100644
--- a/rmw_connextdds_common/include/rmw_connextdds/context.hpp
+++ b/rmw_connextdds_common/include/rmw_connextdds/context.hpp
@@ -58,6 +58,7 @@ enum class RMW_Connext_RequestReplyMapping
   Extended
 };
 
+// Definition of struct rmw_context_impl_s as declared in rmw/init.h
 struct rmw_context_impl_s
 {
   rmw_dds_common::Context common;