diff --git a/src/Actor.cpp b/src/Actor.cpp
index 5171faef46..29997a371b 100644
--- a/src/Actor.cpp
+++ b/src/Actor.cpp
@@ -1378,6 +1378,9 @@ public:
 	static int rotationx( T* p, lua_State *L )		{ p->SetRotationX(FArg(1)); return 0; }
 	static int rotationy( T* p, lua_State *L )		{ p->SetRotationY(FArg(1)); return 0; }
 	static int rotationz( T* p, lua_State *L )		{ p->SetRotationZ(FArg(1)); return 0; }
+	static int addrotationx( T* p, lua_State *L )		{ p->AddRotationX(FArg(1)); return 0; }
+	static int addrotationy( T* p, lua_State *L )		{ p->AddRotationY(FArg(1)); return 0; }
+	static int addrotationz( T* p, lua_State *L )		{ p->AddRotationZ(FArg(1)); return 0; }
 	static int getrotation( T* p, lua_State *L )		{ lua_pushnumber(L, p->GetRotationX()); lua_pushnumber(L, p->GetRotationY()); lua_pushnumber(L, p->GetRotationZ()); return 3; }
 	static int baserotationx( T* p, lua_State *L )		{ p->SetBaseRotationX(FArg(1)); return 0; }
 	static int baserotationy( T* p, lua_State *L )		{ p->SetBaseRotationY(FArg(1)); return 0; }
@@ -1588,6 +1591,9 @@ public:
 		ADD_METHOD( rotationx );
 		ADD_METHOD( rotationy );
 		ADD_METHOD( rotationz );
+		ADD_METHOD( addrotationx );
+		ADD_METHOD( addrotationy );
+		ADD_METHOD( addrotationz );
 		ADD_METHOD( getrotation );
 		ADD_METHOD( baserotationx );
 		ADD_METHOD( baserotationy );
diff --git a/src/Actor.h b/src/Actor.h
index 9b04700fd7..3fd4cbcda5 100644
--- a/src/Actor.h
+++ b/src/Actor.h
@@ -103,7 +103,6 @@ public:
 		RectF		fade;	// 0 = no fade
 		RageColor	diffuse[4];
 		RageColor	glow;
-		// GlowMode	glowmode; // oh hello...
 		float		aux;
 	};
 
@@ -191,9 +190,14 @@ public:
 	float GetRotationX() const			{ return DestTweenState().rotation.x; }
 	float GetRotationY() const			{ return DestTweenState().rotation.y; }
 	float GetRotationZ() const			{ return DestTweenState().rotation.z; }
-	void  SetRotationX( float rot )			{ DestTweenState().rotation.x = rot; }
-	void  SetRotationY( float rot )			{ DestTweenState().rotation.y = rot; }
-	void  SetRotationZ( float rot )			{ DestTweenState().rotation.z = rot; }
+	void  SetRotationX( float rot )		{ DestTweenState().rotation.x = rot; }
+	void  SetRotationY( float rot )		{ DestTweenState().rotation.y = rot; }
+	void  SetRotationZ( float rot )		{ DestTweenState().rotation.z = rot; }
+	// added in StepNXA, now available in sm-ssc:
+	void  AddRotationX( float rot )		{ DestTweenState().rotation.x += rot; };
+	void  AddRotationY( float rot )		{ DestTweenState().rotation.y += rot; };
+	void  AddRotationZ( float rot )		{ DestTweenState().rotation.z += rot; };
+	// and these were normally in SM:
 	void  AddRotationH( float rot );
 	void  AddRotationP( float rot );
 	void  AddRotationR( float rot );