Document use of default charset

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/fileupload/trunk@1455626 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/commons/fileupload/FileUploadBase.java b/src/main/java/org/apache/commons/fileupload/FileUploadBase.java
index 4622fa2..b65eb47 100644
--- a/src/main/java/org/apache/commons/fileupload/FileUploadBase.java
+++ b/src/main/java/org/apache/commons/fileupload/FileUploadBase.java
@@ -429,7 +429,7 @@
         try {
             boundary = boundaryStr.getBytes("ISO-8859-1");
         } catch (UnsupportedEncodingException e) {
-            boundary = boundaryStr.getBytes();
+            boundary = boundaryStr.getBytes(); // Intentionally falls back to default charset
         }
         return boundary;
     }