diff --git a/src/chapter5/Example23.java b/src/chapter5/Example23.java
new file mode 100644
index 0000000..4b18e7a
--- /dev/null
+++ b/src/chapter5/Example23.java
@@ -0,0 +1,4 @@
+package chapter5;
+
+public class Example23 {
+}