diff --git a/README b/README
index 6e07b04..7f2ca78 100644
--- a/README
+++ b/README
@@ -9,6 +9,7 @@ PHP
 GetText
 UFPDF - PDF generation library from http://acko.net/node/56
 OpenSSL - X.509 toolkit from http://www.openssl.org/
+openssl-vulnkey including blacklists for all common key sizes
 GnuPG - OpenPGP toolkit from http://www.gnupg.org/
 whois - whois client from http://www.linux.it/~md/software/
 XEnroll - Enrollment Active-X control for IE5/6 from Microsoft (search for xenroll.cab)