Code-coverage.md

+## Presentation
+
 Some of the testsuite tests have an option code coverage enabled. This option allows knowing which part of the code has been tested by the testsuite, and which part of the code remains untested.
 
 ![Capture_d_écran_de_2019-08-13_18-01-32](uploads/5b0e78819ddb11e087cffbfb9c3079a7/Capture_d_écran_de_2019-08-13_18-01-32.png)
@@ -13,4 +15,8 @@ The second table gives detailed information about each source code file of Alya.
 
 You can click on the file to get more insight into the code parts that have been tested.
 
-![Capture_d_écran_de_2019-08-13_18-10-48](uploads/9cece5dc5e818c3d9e9ad9266f8dc6b8/Capture_d_écran_de_2019-08-13_18-10-48.png)
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+![Capture_d_écran_de_2019-08-13_18-10-48](uploads/9cece5dc5e818c3d9e9ad9266f8dc6b8/Capture_d_écran_de_2019-08-13_18-10-48.png)
+
+## Code coverage and contributions
+
+The code coverage helps to relate novelties or changes in the code to the testsuite tests. Thus, we can detect if a change in the code will be evaluated by the testsuite. If you wish to contribute to Alya, we will ask you to design and set up a test that checks the part of the codes that have been added or modified, or we reserve the right to reject your contribution.
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