diff --git a/docs/configuration/endpoint/tailscale.md b/docs/configuration/endpoint/tailscale.md
index c2fccecf..298b68ce 100644
--- a/docs/configuration/endpoint/tailscale.md
+++ b/docs/configuration/endpoint/tailscale.md
@@ -37,6 +37,10 @@ Example: `$HOME/.tailscale`
 
 #### auth_key
 
+!!! note
+    
+    Auth key is not required. By default, sing-box will log the login URL (or popup a notification on graphical clients).
+
 The auth key to create the node. If the node is already created (from state previously stored), then this field is not
 used.