diff --git a/spring-web/src/main/java/org/springframework/web/multipart/support/MultipartFilter.java b/spring-web/src/main/java/org/springframework/web/multipart/support/MultipartFilter.java
index b9ac26ed9c..577b4e3b85 100644
--- a/spring-web/src/main/java/org/springframework/web/multipart/support/MultipartFilter.java
+++ b/spring-web/src/main/java/org/springframework/web/multipart/support/MultipartFilter.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2016 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.
@@ -39,6 +39,10 @@ import org.springframework.web.multipart.MultipartResolver;
  * <p>If no MultipartResolver bean is found, this filter falls back to a default
  * MultipartResolver: {@link StandardServletMultipartResolver} for Servlet 3.0,
  * based on a multipart-config section in {@code web.xml}.
+ * Note however that at present the Servlet specification only defines how to
+ * enable multipart configuration on a Servlet and as a result multipart request
+ * processing is likely not possible in a Filter unless the Servlet container
+ * provides a workaround such as Tomcat's "allowCasualMultipartParsing" property.
  *
  * <p>MultipartResolver lookup is customizable: Override this filter's
  * {@code lookupMultipartResolver} method to use a custom MultipartResolver