list the source

diff --git a/tests/sha1sum/sample-vec b/tests/sha1sum/sample-vec
index e38a3f87e18b7657b0e3455f84c6b2fdad815759..092276d13e2891439fef57ec3799bdaaa08829ef 100755 (executable)
--- a/tests/sha1sum/sample-vec
+++ b/tests/sha1sum/sample-vec
@@ -19,6 +19,9 @@ use strict;
 # Turn off localisation of executable's ouput.
 @ENV{qw(LANGUAGE LANG LC_ALL)} = ('C') x 3;
 
+# The data from which these tests were derived came from here:
+# http://csrc.nist.gov/cryptval/shs/sha1-vectors.zip
+
 my @Tests =
     (
      ['1', {IN=> {f=> '0 1 ^'}},