diff --git a/examples_test.go b/examples_test.go
index c031f8b..b2140bc 100644
--- a/examples_test.go
+++ b/examples_test.go
@@ -119,6 +119,14 @@ func Example_minimalAnnotated() {
 }
 
 func Example_minimal() {
+	// Let's write a small example for parsing a really basic calculator.
+	// The calculator understands input that looks like:
+	//
+	//     10 + 20 - 8+4
+	//
+	// So positive numbers that can be either added or substracted, with
+	// optional whitespace around the operators.
+
 	var c, a, m = parsekit.C, parsekit.A, parsekit.M
 
 	var number = c.OneOrMore(a.Digit)