diff --git a/nhf/primitive.py b/nhf/primitive.py
index ac9209c..35e1565 100644
--- a/nhf/primitive.py
+++ b/nhf/primitive.py
@@ -1,4 +1,12 @@
-import cadquery
+import cadquery as Cq
 
 def mystery():
-    return cadquery.Workplane().box(10, 5, 5)
+    return (
+        Cq.Workplane("XY")
+        .box(10, 5, 5)
+        .faces(">Z")
+        .workplane()
+        .hole(1)
+        .edges("|Z")
+        .fillet(2)
+    )