diff --git a/examples/ellip_grating.py b/examples/ellip_grating.py
index e6fe438..948df42 100644
--- a/examples/ellip_grating.py
+++ b/examples/ellip_grating.py
@@ -13,9 +13,12 @@ def main():
         pat.shapes.append(shapes.Arc(
             radii=(rmin, rmin),
             width=0.1,
-            angles=(-numpy.pi/4, numpy.pi/4)
+            angles=(-numpy.pi/4, numpy.pi/4),
+            layer=(0, 0),
         ))
 
+    pat.labels.append(masque.Label(string='grating centerline', offset=(1, 0), layer=(1, 2)))
+
     pat.scale_by(1000)
     pat.visualize()
     pat2 = pat.copy()