diff a/hat/docs/Development/project-layout.md b/hat/docs/Development/project-layout.md
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+++ b/hat/docs/Development/project-layout.md
@@ -0,0 +1,35 @@
+# Project Layout
+[Back to Index ../](../index.md)
+
+```tree
+${BABYLON_JDK}
+  ./
+     +--core
+     |    +--src/main/java
+     |    |    +--hat/
+     |    |
+     |    +--src/main/test
+     |         +--hat/
+     |
+     +--backends
+     |    +--java
+     |    |    +--mt                    (*)
+     |    |    +--seq                   (*)
+     |    +--jextracted
+     |    |    +--opencl                (*)
+     |    +--ffi
+     |    |    +--opencl                (*)
+     |    |    +--ptx                   (*)
+     |    |    +--mock                  (*)
+     |    |    +--spirv                 (*)
+     |    |    +--cuda                  (*)
+     |    |    +--hip                   (*)
+     |
+     +--examples
+     |    +--mandel                (*)
+     |    +--squares               (*)
+     |    +--heal                  (*)
+     |    +--life                  (*)
+     |    +--violajones            (*)
+
+```