diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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+All proposed improvements are welcome. Just make sure that you have tested your changes before you submit new pull request.
+
+* Can you run the MLL OS (``./qemu.sh``) with the changes you have made after full build from clean source tree?
+* Can you run the MLL OS (``./qemu.sh``) with the changes you have made after partial rebuild (./rebuild.sh)?
+* Can you run shell console in Docker (``./run_docker_console.sh``) from the MLL image with the changes you have made after full build from clean source tree?
+* Can you run shell console in Docker (``./run_docker_console.sh``) from the MLL image with the changes you have made after after partial rebuild (``./rebuild.sh``)?