diff --git a/Linux/certbot_nginx.md b/Linux/certbot_nginx.md
new file mode 100644
index 0000000..ee09331
--- /dev/null
+++ b/Linux/certbot_nginx.md
@@ -0,0 +1,13 @@
+# Certbot renew certificate
+
+## touch nginx config
+
+```
+sudo certbot --nginx
+```
+
+## certificate only
+
+```
+sudo certbot certonly --nginx
+```
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diff --git a/Readme.md b/Readme.md
index f4e444a..d68dbd9 100644
--- a/Readme.md
+++ b/Readme.md
@@ -4,6 +4,9 @@ This is a repository with useful snippets of various kinds of code
 
 ## Structure
 
+- [Linux](./src/branch/master/Linux/)
+- - [certbot_nginx](./src/branch/master/Linux/certbot_nginx.md)
+
 - [MySQL](./src/branch/master/MySQL)
 - - [all_foreign_keys_to_table_or_column](./src/branch/master/MySQL/all_foreign_keys_to_table_or_column.md)
 - - [identify_lock](./src/branch/master/MySQL/identify_lock.md)
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