diff --git a/README.md b/README.md
index ef73f71..d3a5f87 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,14 @@
 # SSH
 
+## server configuration
+
+```bash
+# disable password authentication
+PasswordAuthentication no
+# disable root login
+PermitRootLogin no
+```
+
 ## Create key
 
 ```bash