README: add dependency on OpenSSL

diff --git a/README b/README
index afb64d84f741b45e1b38987c0bfaf4119f1bcbf4..93e85efa89334045debe0d0309c92e7e2052db96 100644 (file)
--- a/README
+++ b/README
@@ -88,7 +88,11 @@ apt-get install gcc make python-dev python-twisted python-pyopenssl".
    libraries with the cygwin package management tool, then get the pyOpenSSL
    source code, cd into it, and run "python ./setup.py install".
 
- + the pywin32 package: required only on Windows
+ + OpenSSL (cryptography library)
+
+   http://openssl.org
+  
+ + the pywin32 package; required only on Windows
 
    http://sourceforge.net/projects/pywin32/