diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 222f8b3..0647489 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -28,7 +28,7 @@ We support Julia versions 0.4+. [See issue #26](https://github.com/JuliaFEM/Juli
 
 Only pull requests to src folder
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-See [issue #29](https://github.com/JuliaFEM/JuliaFEM.jl/issues/29). This ensures peer review check for contributors and hopefully will decrease the number of merge conflicts. 
+See [issue #29](https://github.com/JuliaFEM/JuliaFEM.jl/issues/29). This ensures peer review check for contributors and hopefully will decrease the number of merge conflicts. Before making the pull request runn all test: either type `julia> Pkg.test("JuliaFEM")` at REPL or `julia test/runtests.jl` at command line. 
 
 New technology should be introduced through notebooks
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