diff --git a/src/main/java/org/apache/commons/fileupload/MultipartStream.java b/src/main/java/org/apache/commons/fileupload/MultipartStream.java
index 514bebc..3438342 100644
--- a/src/main/java/org/apache/commons/fileupload/MultipartStream.java
+++ b/src/main/java/org/apache/commons/fileupload/MultipartStream.java
@@ -590,7 +590,7 @@
     public int readBodyData(OutputStream output)
             throws MalformedStreamException, IOException {
         final InputStream istream = newInputStream();
-        return (int) Streams.copy(istream, output, false);
+        return (int) Streams.copy(istream, output, false); // N.B. Streams.copy closes the input stream
     }
 
     /**