diff --git a/README.md b/README.md
index ddd1611c..d06f194e 100644
--- a/README.md
+++ b/README.md
@@ -200,7 +200,7 @@ Table of Contents
   * [letsencrypt.org](https://letsencrypt.org/) — Free SSL Certificate Authority with certs trusted by all major browsers
   * [globalsign.com](https://www.globalsign.com/en/ssl/ssl-open-source/) — Free SSL certificates for Open Source
   * [Okta](https://developer.okta.com/) — User management, authentication and authorization. Free for up to 1000 monthly active users.
-  * [auth0.com](https://auth0.com/) — Hosted free for development SSO
+  * [auth0.com](https://auth0.com/) — Hosted free for development SSO. Up to 2 social identity providers for closed-source projects.
   * [ringcaptcha.com](https://ringcaptcha.com/) — Tools to use phone number as id, available for free
   * [ssllabs.com](https://www.ssllabs.com/ssltest/) — Very deep analysis of the configuration of any SSL web server
   * [qualys.com](https://www.qualys.com/forms/freescan/owasp/) — Find web app vulnerabilities, audit for OWASP Risks