diff --git a/domain/auth/cas/README.md b/domain/auth/cas/README.md
index a8e0924f..99a530c9 100644
--- a/domain/auth/cas/README.md
+++ b/domain/auth/cas/README.md
@@ -10,12 +10,16 @@ https://www.apereo.org/projects/cas
 
 Documize is tested against the CAS version 5.3.x.
 
+## Run a CAS server
+
+Refer to the following like [https://apereo.github.io/cas/5.0.x/installation/Docker-Installation.html](https://apereo.github.io/cas/5.0.x/installation/Docker-Installation.html) to run CAS server. Usually the server address is `https://localhost:8443/cas".
+
 ## Configuring Documize
 
 CAS authentication is configured and enabled from Settings.
 
 Type in the CAS Server URL, Redirect URL.
 
-* **CAS Server URL**: The CAS host address, eg: `https://cas.example.com`
+* **CAS Server URL**: The CAS host address, eg: `https://localhost:8443/cas`
 * **Redirect URL**: The CAS authorize callback URL. If your documize URL is `https://example.documize.com,` then redirect URL is `https://example.documize.com/auth/cas`.