diff --git a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/event/ApplicationContextInitializedEvent.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/event/ApplicationContextInitializedEvent.java
index dd88bbfb055..d44a8c3673f 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/event/ApplicationContextInitializedEvent.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/event/ApplicationContextInitializedEvent.java
@@ -26,6 +26,7 @@ import org.springframework.context.ConfigurableApplicationContext;
  * called but before any bean definitions are loaded.
  *
  * @author Artsiom Yudovin
+ * @since 2.1.0
  */
 @SuppressWarnings("serial")
 public class ApplicationContextInitializedEvent extends SpringApplicationEvent {