diff --git a/config.example.json b/config.example.json
index 48adb0b..f3cb569 100644
--- a/config.example.json
+++ b/config.example.json
@@ -43,6 +43,8 @@
 		"hideIP": false
 	},
 
+	"upstreamCheckInterval": "5s",
+
 	"upstream": [
 		{
 			"name": "Main",