diff --git a/playground/calendar.go b/playground/calendar.go
new file mode 100644
index 0000000..c1146bc
--- /dev/null
+++ b/playground/calendar.go
@@ -0,0 +1,6 @@
+// from chapter 10
+package main
+
+func calendar() {
+
+}
diff --git a/playground/playground.go b/playground/playground.go
index e265b89..05c4b74 100644
--- a/playground/playground.go
+++ b/playground/playground.go
@@ -110,6 +110,12 @@ func main() {
 				fuel()
 			},
 		},
+		{
+			name: "Calendar",
+			launchFunction: func() {
+				calendar()
+			},
+		},
 	}
 	menu := wmenu.NewMenu("Choose a program.")
 	menu.Action(func(opts []wmenu.Opt) error {