add rfc 3526 DH groups (#3767)
diff --git a/docs/development/test-vectors.rst b/docs/development/test-vectors.rst
index d54cb10..eb95a62 100644
--- a/docs/development/test-vectors.rst
+++ b/docs/development/test-vectors.rst
@@ -89,6 +89,9 @@
Key exchange
~~~~~~~~~~~~
+* ``vectors/cryptography_vectors/asymmetric/DH/rfc3526.txt`` contains
+ several standardized Diffie-Hellman groups from :rfc:`3526`.
+
* ``vectors/cryptography_vectors/asymmetric/DH/RFC5114.txt`` contains
Diffie-Hellman examples from appendix A.1, A.2 and A.3 of :rfc:`5114`.