diff --git a/src/math/rand/example_test.go b/src/math/rand/example_test.go
index adeeaa0b46..4107613555 100644
--- a/src/math/rand/example_test.go
+++ b/src/math/rand/example_test.go
@@ -140,3 +140,18 @@ func ExampleShuffle_slicesInUnison() {
 	// E: 5
 	// B: 2
 }
+
+func ExampleIntn() {
+	// Seeding with the same value results in the same random sequence each run.
+	// For different numbers, seed with a different value, such as
+	// time.Now().UnixNano(), which yields a constantly-changing number.
+	rand.Seed(86)
+	fmt.Println(rand.Intn(100))
+	fmt.Println(rand.Intn(100))
+	fmt.Println(rand.Intn(100))
+
+	// Output:
+	// 42
+	// 76
+	// 30
+}