diff --git a/formatting/formatting.go b/formatting/formatting.go
index ffef30a..72f03e2 100644
--- a/formatting/formatting.go
+++ b/formatting/formatting.go
@@ -33,4 +33,5 @@ func Formatting() {
 	f("go num width (left align): |%-5d|\n", 2)
 	f("go float precision (left align): |%-5.2f|\n", 3.141516)
 	f("go char: %c\n", 97)
+	f("go custom width specifier: |%*s|\n", 5, "foo")
 }