add SEED CFB/OFB bespoke vectors and documentation
diff --git a/docs/development/test-vectors.rst b/docs/development/test-vectors.rst
index d2e9548..a1692c1 100644
--- a/docs/development/test-vectors.rst
+++ b/docs/development/test-vectors.rst
@@ -79,6 +79,8 @@
   See: :doc:`/development/custom-vectors/idea`
 * SEED (ECB) from :rfc:`4269`.
 * SEED (CBC) from :rfc:`4196`.
+* SEED (CFB, OFB) generated by this project.
+  See: :doc:`/development/custom-vectors/seed`
 
 Two factor authentication
 ~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -98,6 +100,7 @@
 
     custom-vectors/cast5
     custom-vectors/idea
+    custom-vectors/seed
 
 If official test vectors appear in the future the custom generated vectors
 should be discarded.