expand documentation on using letsencrypt staging ca

diff --git a/docs/staging.md b/docs/staging.md
index 6e6a84b6400a41df712d18f09c584c9766ff8ea0..07c675b92a4756b5024dbfb5f591965ca15be2c7 100644 (file)
--- a/docs/staging.md
+++ b/docs/staging.md
@@ -10,3 +10,5 @@ To avoid this, please set the CA property to the Let’s Encrypt staging server
 ```bash
 CA="https://acme-staging-v02.api.letsencrypt.org/directory"
 ```
+
+Alternatively you can define the CA using the CLI argument `--ca letsencrypt-test` (`letsencrypt-test` is an integrated preset-CA corresponding to the URL above).