diff --git a/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/support/ServiceUnavailableException.java b/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/support/ServiceUnavailableException.java
index faca510a..c4651c14 100644
--- a/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/support/ServiceUnavailableException.java
+++ b/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/support/ServiceUnavailableException.java
@@ -20,7 +20,8 @@ import org.springframework.web.bind.annotation.ResponseStatus;
 
 import static org.springframework.http.HttpStatus.SERVICE_UNAVAILABLE;
 
-@ResponseStatus(value = SERVICE_UNAVAILABLE, reason = "Upstream service is temporarily unavailable")
+@ResponseStatus(value = SERVICE_UNAVAILABLE,
+		reason = "Upstream service is temporarily unavailable")
 public class ServiceUnavailableException extends Exception {
 
 	public ServiceUnavailableException() {
@@ -32,7 +33,7 @@ public class ServiceUnavailableException extends Exception {
 
 	/**
 	 * Disables fillInStackTrace for performance reasons.
-	 * @return
+	 * @return this
 	 */
 	@Override
 	public synchronized Throwable fillInStackTrace() {
diff --git a/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/support/TimeoutException.java b/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/support/TimeoutException.java
index 2b996eda..1e77bfb0 100644
--- a/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/support/TimeoutException.java
+++ b/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/support/TimeoutException.java
@@ -33,7 +33,7 @@ public class TimeoutException extends Exception {
 
 	/**
 	 * Disables fillInStackTrace for performance reasons.
-	 * @return
+	 * @return this
 	 */
 	@Override
 	public synchronized Throwable fillInStackTrace() {