Complete the reference

tests/long01.at

@@ -23,7 +23,7 @@
 # extra block of data. In consequence the following file was not extracted.
 # Reported by Josef Bauer
 # References: <[email protected]>
-# 
+#             http://lists.gnu.org/archive/html/bug-tar/2005-01/msg00038.html
 
 AT_SETUP([long file names divisible by block size])
 AT_KEYWORDS([long512])