Clarify the use of the certFingerprint

Author: pitbulk

README.md

@@ -255,13 +255,17 @@ This is the settings.json file:
         // Public x509 certificate of the IdP
         "x509cert": "<onelogin_connector_cert>"
         /*
-         *  Instead of use the whole x509cert you can use a fingerprint
+         *  Instead of use the whole x509cert you can use a fingerprint in order to 
+         *  validate a SAMLResponse.
          *  (openssl x509 -noout -fingerprint -in "idp.crt" to generate it,
-         *   or add for example the -sha256 , -sha384 or -sha512 parameter)
+         *  or add for example the -sha256 , -sha384 or -sha512 parameter)
          *
          *  If a fingerprint is provided, then the certFingerprintAlgorithm is required in order to
          *  let the toolkit know which algorithm was used. Possible values: sha1, sha256, sha384 or sha512
          *  'sha1' is the default value.
+         * 
+         *  Notice that if you want to validate any SAML Message sent by the HTTP-Redirect binding, you
+         *  will need to provide the whole x509cert.
          */
         // 'certFingerprint' => '',
         // 'certFingerprintAlgorithm' => 'sha1',