diff --git a/examples/9999/readme-build.md b/examples/9999/readme-build.md
index 961856f..a66a6cb 100644
--- a/examples/9999/readme-build.md
+++ b/examples/9999/readme-build.md
@@ -1,4 +1,16 @@
 
+Prepare
+-------
+
+If you use Qt versions prior to 5.15, you need to adapt the QML module version
+to your minor Qt version in file `qml/main.qml`.
+
+Example: Qt5.**12** -> import QtQuick 2.**12**.
+
+The version number can be omitted in Qt6.
+
+
+
 Run desktop
 -----------
 ```