diff --git a/spring-web/src/main/java/org/springframework/web/server/ServerWebExchange.java b/spring-web/src/main/java/org/springframework/web/server/ServerWebExchange.java
index 47a63d7fe5a..d8cef567578 100644
--- a/spring-web/src/main/java/org/springframework/web/server/ServerWebExchange.java
+++ b/spring-web/src/main/java/org/springframework/web/server/ServerWebExchange.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -136,6 +136,8 @@ public interface ServerWebExchange {
 	 * <p><strong>Note:</strong> calling this method causes the request body to
 	 * be read and parsed in full and the resulting {@code MultiValueMap} is
 	 * cached so that this method is safe to call more than once.
+	 * <p><strong>Note:</strong>the {@linkplain Part#content() contents} of each
+	 * part is not cached, and can only be read once.
 	 */
 	Mono<MultiValueMap<String, Part>> getMultipartData();