diff --git a/kotlinx-coroutines-core/jvm/test/guide/example-select-01.kt b/kotlinx-coroutines-core/jvm/test/guide/example-select-01.kt
index e4f9d31250..bf15b65507 100644
--- a/kotlinx-coroutines-core/jvm/test/guide/example-select-01.kt
+++ b/kotlinx-coroutines-core/jvm/test/guide/example-select-01.kt
@@ -10,14 +10,14 @@ import kotlinx.coroutines.channels.*
 import kotlinx.coroutines.selects.*
 
 fun CoroutineScope.fizz() = produce<String> {
-    while (true) { // sends "Fizz" every 300 ms
+    while (true) { // sends "Fizz" every 500 ms
         delay(500)
         send("Fizz")
     }
 }
 
 fun CoroutineScope.buzz() = produce<String> {
-    while (true) { // sends "Buzz!" every 500 ms
+    while (true) { // sends "Buzz!" every 1000 ms
         delay(1000)
         send("Buzz!")
     }