diff --git a/libs/ardour/ardour/types.h b/libs/ardour/ardour/types.h
index 0df1cdf9e8..53926554cb 100644
--- a/libs/ardour/ardour/types.h
+++ b/libs/ardour/ardour/types.h
@@ -811,6 +811,13 @@ enum LocateTransportDisposition {
 	RollIfAppropriate
 };
 
+enum KeyEnforcementPolicy {
+	NoDraw = 0x1, /* do not show visually as candidate for new notes */
+	ForceLower = 0x2,
+	ForceHigher = 0x4,
+	ForceNearest = 0x8
+};
+
 typedef std::vector<CaptureInfo*> CaptureInfos;
 
 } // namespace ARDOUR
diff --git a/libs/ardour/enums.cc b/libs/ardour/enums.cc
index 2b1affe831..662580ba7e 100644
--- a/libs/ardour/enums.cc
+++ b/libs/ardour/enums.cc
@@ -158,6 +158,7 @@ setup_enum_writer ()
 	Trigger::State _TriggerState;
 	Trigger::LaunchStyle _TriggerLaunchStyle;
 	Trigger::FollowAction _TriggerFollowAction;
+	KeyEnforcementPolicy _KeyEnforcementPolicy;
 
 #define REGISTER(e) enum_writer.register_distinct (typeid(e).name(), i, s); i.clear(); s.clear()
 #define REGISTER_BITS(e) enum_writer.register_bits (typeid(e).name(), i, s); i.clear(); s.clear()
@@ -868,6 +869,11 @@ setup_enum_writer ()
 	REGISTER_CLASS_ENUM (Trigger, Repeat);
 	REGISTER (_TriggerLaunchStyle);
 
+	REGISTER_ENUM (NoDraw);
+	REGISTER_ENUM (ForceLower);
+	REGISTER_ENUM (ForceHigher);
+	REGISTER_ENUM (ForceNearest);
+	REGISTER (_KeyEnforcementPolicy);
 }
 
 } /* namespace ARDOUR */