diff --git a/libwccl/variables.h b/libwccl/variables.h
index 6f124de3d70a6c8c98dee1e9e626e5e3f179cb79..bf2259e2629e3b8d39476f464bb7f8656041d181 100644
--- a/libwccl/variables.h
+++ b/libwccl/variables.h
@@ -77,7 +77,7 @@ public:
  * Values are subtypes of the Value class, valid types are listed as arguments
  * of instantiations of the detail::Vmap base class template, and in the type
  * list below. Adding a new subtype should only take adding it to these two
- * places.
+ * places: inherit from another Vmap, add to typelist.
  */
 class Variables : detail::Vmap<Value>
 	, detail::Vmap<Bool>