diff --git a/nginx/README.md b/nginx/README.md
index dfb65fd..3a72674 100644
--- a/nginx/README.md
+++ b/nginx/README.md
@@ -6,6 +6,6 @@ Do this in `/etc/nginx` (or if using Docker, the directory that maps to it)
 4. Generate dhparam and snakeoil cert:
 ```
 openssl dhparam -out dhparam.pem 4096 # This will take a few minutes. Reduce to 3072 if you'd like.
-openssl req -new -x509 -days 365 -noenc -out snakeoil.pem -keyout snakeoil.key # just keep pressing Enter
+openssl req -new -x509 -days 365 -noenc -out snakeoil.pem -keyout snakeoil.key -subj "/"
 ```
 5. `server` entries go into `conf.d/`. See [server.conf](server.conf) for a template.