diff --git a/demos/sphere-discrete.geo b/demos/sphere-discrete.geo
index 6f9a16757ac7a847bd8cee464c2ecdd9ee603919..096b842ede478da8576df9550252192856213815 100644
--- a/demos/sphere-discrete.geo
+++ b/demos/sphere-discrete.geo
@@ -6,3 +6,7 @@ Merge "sphere-surf.stl";
 
 Surface Loop(1) = {1};
 Volume(1) = {1};
+
+// use this to force a coarse mesh inside
+//Mesh.CharacteristicLengthExtendFromBoundary = 0;
+//Mesh.CharacteristicLengthMax = 0.5;