diff --git a/Linux/Linux_general_commands.md b/Linux/Linux_general_commands.md
index 73e332e..0eacb27 100644
--- a/Linux/Linux_general_commands.md
+++ b/Linux/Linux_general_commands.md
@@ -1,4 +1,9 @@
 ### updates
 ```bash
 sudo apt-get update && sudo apt-get full-upgrade && sudo apt-get autoclean && sudo apt-get autoremove --purge
+```
+
+### lets encrypt verlängern
+```bash
+sudo certbot renew --dry-run
 ```
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