add SEED ECB vectors from rfc 4269
diff --git a/docs/development/test-vectors.rst b/docs/development/test-vectors.rst
index 484d06b..b580855 100644
--- a/docs/development/test-vectors.rst
+++ b/docs/development/test-vectors.rst
@@ -77,6 +77,7 @@
 * IDEA (ECB) from the `NESSIE IDEA vectors`_ created by `NESSIE`_.
 * IDEA (CBC, CFB, OFB) generated by this project.
   See: :doc:`/development/custom-vectors/idea`
+* SEED (ECB) from :rfc:`4269`.
 
 Two factor authentication
 ~~~~~~~~~~~~~~~~~~~~~~~~~