diff --git a/examples/ddt/ddt-test2.cir b/examples/ddt/ddt-test2.cir
new file mode 100644
index 000000000..a101f62b3
--- /dev/null
+++ b/examples/ddt/ddt-test2.cir
@@ -0,0 +1,18 @@
+dd test 2 with .func
+
+V1 1 0 dc 0 pulse 0 2 0 1 1 1 4
+
+B2 2 0 v = ddt(V(1))
+
+B3 3 0 v = border(v(1))
+
+.func border(x) if (ddt(x) > 0, 1, 0)
+
+.tran 1m 8
+
+.control
+run
+plot v(1) v(2) v(3)
+.endc
+
+.end