diff --git a/INSTALL.md b/INSTALL.md
index cbb9e56e..ca1d7eaa 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -114,7 +114,8 @@ pip install -r requirements.txt
 
 ### Extra info
 
-* `SERVER_NAME` should be the domain of the site/instance. Use `127.0.0.1:5000` during development unless using ngrok.
+* `SERVER_NAME` should be the domain of the site/instance. Use `127.0.0.1:5000` during development unless using ngrok. Just use the bare
+domain name, without https:// on the front or a slash on the end.
 * `RECAPTCHA_PUBLIC_KEY` and `RECAPTCHA_PRIVATE_KEY` can be generated at https://www.google.com/recaptcha/admin/create (this is optional - omit to allow registration without RECAPCHA).
 * `CACHE_TYPE` can be `FileSystemCache` or `RedisCache`. `FileSystemCache` is fine during development (set `CACHE_DIR` to `/tmp/piefed` or `/dev/shm/piefed`)
 while `RedisCache` **should** be used in production. If using `RedisCache`, set `CACHE_REDIS_URL` to `redis://localhost:6379/1`. Visit https://yourdomain/testredis to check if your redis url is working.