diff --git a/SECURITY.md b/SECURITY.md
new file mode 100644
index 0000000..56c2d6e
--- /dev/null
+++ b/SECURITY.md
@@ -0,0 +1,17 @@
+# Advanced security for ReasonableFramework
+Web hacking firewall(XSS, CSRF, SQL injection, ...), DDoS protection, Webshell (malicious code) detection, secure configuration check. these extensions are only available for sponsors.
+Even if you do not use a sponsor-only security module, the default security in our framework is usually sufficient.
+Please note that this program is for those who want better security than the default.
+
+## Related files
+- helper / php-sec-fw.lnk.php
+- helper / php-sec-ddos.lnk.php
+- helper / php-sec-shell.lnk.php
+- helper / php-sec-scc.lnk.php
+
+## Minimum tier
+- 4 USD/monthly (Special thanks + Up to contributor)
+
+Thank you.
+
+https://www.patreon.com/posts/27376670