Use RTD theme
diff --git a/doc/README b/doc/README
index 2a525bb..2c6359c 100644
--- a/doc/README
+++ b/doc/README
@@ -1,4 +1,4 @@
 This is the pyOpenSSL documentation source.  It uses Sphinx.  To build the
-documentation, install Sphinx 1.0 and run:
+documentation, install Sphinx and run:
 
     $ make html