diff --git a/readme.md b/readme.md
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+The virtualtree source must be cloned as a submodule into src.virtualtree folder.
+
+git submodule add https://github.com/JAM-Software/Virtual-TreeView.git src.virtualtree
+
+Cloning a project with submodules needs the following after commands:
+- git submodule init
+- git submodule update
+
+
+