Merge branch '2.1.x'

spring-boot-project/spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -8686,6 +8686,12 @@ documentation] for more details. You also need to
 {junit5-documentation}/#writing-tests-test-instance-lifecycle-changing-default[switch test
 instance lifecycle to "per-class"].
 
+To mock Kotlin classes, https://mockk.io/[Mockk] is recommended. If you need the `Mockk`
+equivalent of the Mockito specific
+<<boot-features-testing-spring-boot-applications-mocking-beans,`@MockBean` and `@SpyBean`
+annotations>>, you can use https://github.com/Ninja-Squad/springmockk[SpringMockK] which
+provides similar `@MockkBean` and `@SpykBean` annotations.
+
 
 
 [[boot-features-kotlin-resources]]