diff --git a/lib/pddlparse/include/pddlparse/AST.h b/lib/pddlparse/include/pddlparse/AST.h
index d157059..40e0843 100644
--- a/lib/pddlparse/include/pddlparse/AST.h
+++ b/lib/pddlparse/include/pddlparse/AST.h
@@ -486,6 +486,7 @@ struct Problem
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
+// TODO: think about ignoring requirement statements entirely and computing them instead
 enum class Requirement
 {
 	STRIPS,