diff --git a/docs/lib-arc.md b/docs/lib-arc.md
index 6e8a1623..bef9b1d5 100644
--- a/docs/lib-arc.md
+++ b/docs/lib-arc.md
@@ -18,13 +18,17 @@ Create an arc. You can pass a 2 element vector to define the central angle. Its
 
 ![arc](images/lib-arc-1.JPG)
 
+    $fn = 24;
     arc(radius = 20, angles = [45, 290], width = 2, width_mode = "LINE_INWARD");
     %circle(r = 20); 
 
 ![arc](images/lib-arc-2.JPG)
 
+    $fn = 24;
     arc(radius = 20, angles = [45, 290], width = 2, width_mode = "LINE_OUTWARD");
     %circle(r = 20); 
 
 ![arc](images/lib-arc-3.JPG)
 
+
+