diff --git a/README.md b/README.md
index 264eea1..cc758a8 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,8 @@ The following options are possible:
 * **ip**(optional, defaults to listen on all IPs) the IP on which the proxy should listen.
 * **location**(optional) if the proxied web application is not running on the /-path
 * **body_size**(optional, defaults to 1MB) the allowed maximal body size as defined in http://nginx.org/en/docs/http/ngx_http_core_module.html#client_max_body_size
-* **auth_data**(optional, defaults to none) If set, the value must be constructed like `Realm;Username;Password` e.g. `SecretWebsite;admin;$apr1$RR/RTfI.$s7mRx/yKay7g3Jxmg/eMT/`. The crypted password can be created with `htpasswd`: ` htpasswd -n -b admin supersecret`
+* **auth_data**(optional, defaults to none) If set, the value must be constructed like `Realm;Username;Password` e.g. `SecretWebsite;admin;$apr1$RR/RTfI.$s7mRx/yKay7g3Jxmg/eMT/`. The crypted password can be created with `htpasswd`: ` htpasswd -n -b admin supersecret`. **Note**: If used in with docker-compose, the `$` must be doubled: `SecretWebsite;admin;$$apr1$$RR/RTfI.$$s7mRx/yKay7g3Jxmg/eMT/` 
+
 ## Starting the container
 
 Since the container uses Docker's internal event reporting, it needs access to the daemon. At the