diff --git a/include/plasp/pddl/Requirement.h b/include/plasp/pddl/Requirement.h
new file mode 100644
index 0000000..b0831ea
--- /dev/null
+++ b/include/plasp/pddl/Requirement.h
@@ -0,0 +1,44 @@
+#ifndef __PLASP__PDDL__REQUIREMENT_H
+#define __PLASP__PDDL__REQUIREMENT_H
+
+namespace plasp
+{
+namespace pddl
+{
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+//
+// Requirement
+//
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+enum class Requirement
+{
+	STRIPS,
+	Typing,
+	NegativePreconditions,
+	DisjunctivePreconditions,
+	Equality,
+	ExistentialPreconditions,
+	UniversalPreconditions,
+	QuantifiedPreconditions,
+	ConditionalEffects,
+	Fluents,
+	NumericFluents,
+	ADL,
+	DurativeActions,
+	DurationInequalities,
+	ContinuousEffects,
+	DerivedPredicates,
+	TimedInitialLiterals,
+	Preferences,
+	Constraints,
+	ActionCosts
+};
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+}
+}
+
+#endif