diff --git a/UpdatePTUDevCtrl/update.cpp b/UpdatePTUDevCtrl/update.cpp
index 5ae710d..bcda1f7 100644
--- a/UpdatePTUDevCtrl/update.cpp
+++ b/UpdatePTUDevCtrl/update.cpp
@@ -525,14 +525,18 @@ bool Update::updatePrinterTemplate(int templateIdx, QString jsFile) const {
 }
 
 bool Update::updateConfig(QString jsFile) {
+    // IMPORTANT: the JSON-file has a 'title'-line: the value MUST be 'DC2C_config'
     return downloadJson(FileTypeJson::CONFIG, 0, jsFile);
 }
 
 bool Update::updateCashConf(QString jsFile) {
+    // IMPORTANT: the JSON-file has a 'title'-line: the value MUST be 'DC2C_cash  '
+    // Note the twp spaces after DC2C_cash !!
     return downloadJson(FileTypeJson::CASH, 0, jsFile);
 }
 
 bool Update::updateDeviceConf(QString jsFile) {
+    // IMPORTANT: the JSON-file has a 'title'-line: the value MUST be 'DC2C_device'
     return downloadJson(FileTypeJson::DEVICE, 0, jsFile);
 }