diff --git a/README.md b/README.md
index ff2820f1..aab72d1b 100644
--- a/README.md
+++ b/README.md
@@ -70,4 +70,6 @@ To run full-stack app (both server and browser front-end), run
##### gdml
-Visualization example for geometry defined as GDML file.
+Visualization example for geometry defined as GDML file. Once you open Web application,
+drag-and-drop GDML file to the window to see visualization. For example file, use
+`demo\gdml\src\jsMain\resources\cubes.gdml`.
diff --git a/demo/gdml/src/jsMain/resources/cubes.gdml b/demo/gdml/src/jsMain/resources/cubes.gdml
new file mode 100644
index 00000000..4d66c389
--- /dev/null
+++ b/demo/gdml/src/jsMain/resources/cubes.gdml
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diff --git a/demo/gdml/src/jsMain/web/index.html b/demo/gdml/src/jsMain/web/index.html
index 3b2a99b2..bad59418 100644
--- a/demo/gdml/src/jsMain/web/index.html
+++ b/demo/gdml/src/jsMain/web/index.html
@@ -12,10 +12,10 @@
- Загрузить данные
+ title="To load data in text format, drag-and-drop file here">
+ Load data
- (перетащить файл сюда)
+ (drag file here)
GDML demo