diff --git a/config.sample.json b/config.sample.json
index 78a1ad1..5d35b5b 100644
--- a/config.sample.json
+++ b/config.sample.json
@@ -5,6 +5,13 @@
     "apiserver": {
         "port": 9183
     },
+
+    "max_length": 140,
+    "max_message_age_in_secs": 300,
+    "sleep_before_unlock_modem_ms": 1200,
+    "ignore_prefix": false,
+    "number_suffix": "",
+
     "sender": {
         "url": "http://192.168.0.181:59194/service/sendsms",
         "username": "app1",