math/rand: clarify documentation for Seed example

Fixes #25325

Change-Id: I101641be99a820722edb7272918e04e8d2e1646c
Reviewed-on: https://go-review.googlesource.com/112775
Reviewed-by: Rob Pike <r@golang.org>

diff --git a/src/math/rand/example_test.go b/src/math/rand/example_test.go
index aa1f2bcc7341ee0258efaacc9406fd648501a9fe..adeeaa0b469ac71b3b968b51e77508b9521c587d 100644 (file)
--- a/src/math/rand/example_test.go
+++ b/src/math/rand/example_test.go
@@ -16,7 +16,10 @@ import (
 // the output of the random number generator when given a fixed seed.
 
 func Example() {
-       rand.Seed(42) // Try changing this number!
+       // 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(42)
        answers := []string{
                "It is certain",
                "It is decidedly so",