Clarify settings page in the installation instructions

README.md

@@ -30,13 +30,17 @@ See installation instructions for full configuration details.
 
 ## Installation ##
 
-This plugin requires access to a functioning SAML identity provider. If all you need is SAML authentication, then you should use the bundled OneLogin SAML library. If you have more complex authentication needs, then you can also use a SimpleSAMLphp installation running in the same environment.
+Once you've activated the plugin, and have access to a functioning SAML Identity Provider (IdP), there are a couple of ways WP SAML Auth can be configured.
+
+If you're connecting directly to an existing IdP, you should use the bundled OneLogin SAML library. The settings can be configured through the WordPress backend under "Settings" -> "WP SAML Auth". Additional explanation of each setting can be found in the code snippet below.
+
+If you have more complex authentication needs, then you can also use a SimpleSAMLphp installation running in the same environment. These settings are not configurable through the WordPress backend; they'll need to be defined with a filter.
 
 To install SimpleSAMLphp locally for testing purposes, the [Identity Provider QuickStart](https://simplesamlphp.org/docs/stable/simplesamlphp-idp) is a good place to start. On Pantheon, the SimpleSAMLphp web directory needs to be symlinked to `~/code/simplesaml` to be properly handled by Nginx. [Read the docs](https://pantheon.io/docs/shibboleth-sso/) for more details about configuring SimpleSAMLphp on Pantheon.
 
 Because SAML authentication is handled as a part of the login flow, your SAML identity provider will need to send responses back to `wp-login.php`. For instance, if your domain is `pantheon.io`, then you'd use `http://pantheon.io/wp-login.php` as your `AssertionConsumerService` configuration value.
 
-Once you have access to a SAML identity provider, you can configure this plugin using a filter included in your theme's functions.php file or a mu-plugin:
+To configure the plugin with a filter, or for additional detail on each setting, use this code snippet:
 
     function wpsax_filter_option( $value, $option_name ) {
         $defaults = array(

readme.txt

@@ -30,13 +30,17 @@ See installation instructions for full configuration details.
 
 == Installation ==
 
-This plugin requires access to a functioning SAML identity provider. If all you need is SAML authentication, then you should use the bundled OneLogin SAML library. If you have more complex authentication needs, then you can also use a SimpleSAMLphp installation running in the same environment.
+Once you've activated the plugin, and have access to a functioning SAML Identity Provider (IdP), there are a couple of ways WP SAML Auth can be configured.
+
+If you're connecting directly to an existing IdP, you should use the bundled OneLogin SAML library. The settings can be configured through the WordPress backend under "Settings" -> "WP SAML Auth". Additional explanation of each setting can be found in the code snippet below.
+
+If you have more complex authentication needs, then you can also use a SimpleSAMLphp installation running in the same environment. These settings are not configurable through the WordPress backend; they'll need to be defined with a filter.
 
 To install SimpleSAMLphp locally for testing purposes, the [Identity Provider QuickStart](https://simplesamlphp.org/docs/stable/simplesamlphp-idp) is a good place to start. On Pantheon, the SimpleSAMLphp web directory needs to be symlinked to `~/code/simplesaml` to be properly handled by Nginx. [Read the docs](https://pantheon.io/docs/shibboleth-sso/) for more details about configuring SimpleSAMLphp on Pantheon.
 
 Because SAML authentication is handled as a part of the login flow, your SAML identity provider will need to send responses back to `wp-login.php`. For instance, if your domain is `pantheon.io`, then you'd use `http://pantheon.io/wp-login.php` as your `AssertionConsumerService` configuration value.
 
-Once you have access to a SAML identity provider, you can configure this plugin using a filter included in your theme's functions.php file or a mu-plugin:
+To configure the plugin with a filter, or for additional detail on each setting, use this code snippet:
 
     function wpsax_filter_option( $value, $option_name ) {
         $defaults = array(