diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index d52377f1..963f73f1 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -18,18 +18,46 @@ By default Pull Request should be opened against **develop** branch, PR against
 ### Here are a few guidelines you should follow before submitting:
 
 1. **License Acceptance:** All contributions must be licensed as [GNU GPLv3](LICENSE) to be accepted.
-Use `git commit --signoff` to acknowledge this.
-2. **App is migrating to [Kotlin](https://kotlinlang.org/) programming language:** new Pull Requests
-should be written in this programming language.
-3. **No Breakage:** New features or changes to existing ones must not degrade the user experience.
-4. **Coding standards:** best-practices should be followed, comment generously, and avoid "clever" algorithms.
+Use `git commit --signoff` to acknowledge this. 
+2. **No Breakage:** New features or changes to existing ones must not degrade the user experience.
+3. **Coding standards:** best-practices should be followed, comment generously, and avoid "clever" algorithms.
 Refactoring existing messes is great, but watch out for breakage.
-5. **No large PR:** Try to limit the scope of PR only to the related issue, so it will be easier to review
+4. **No large PR:** Try to limit the scope of PR only to the related issue, so it will be easier to review
 and test.
 
 ### Pull Request Process
+On each Pull Request Github runs a number of checks to make sure there are no problems.
+
+#### Signed commits
+Commits must be signed. [See here how to set it up](https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits)
+
+#### KtLint
+This programm checks if the source code is formatted correctly.
+You can run it yourself locally with 
+
+`./gradlew -Pqc ktlintFormat`
+
+Running this command will fix common problems and will notify you of problems it couldn't fix automatically.
+
+#### Detekt
+
+Detekt is a static analyser. It helps to find potential bugs in our code.
+
+You can run it yourself locally with 
+
+`./gradlew -Pqc detekt`
+
+There is a "baseline" file, in which errors which have been in the code base before are noted.
+Sometimes it is necessary to regenerate this file by running:
+
+`./gradlew -Pqc detektBaseline`
+
+#### Lint
+Lint looks for general problems in the code or unused resources etc. 
+You can run it with
+
+`./gradlew -Pqc lintRelease`
+
+If there is a need to regenerate the baseline, remove `ultrasonic/lint-baseline.xml` and rerun the command.
+
 
-1. Ensure [all commits are signed-off](https://docs.github.com/en/free-pro-team@latest/github/authenticating-to-github/about-commit-signature-verification).
-2. Check tests for the new code are added.
-3. Check code style is passing.
-4. Check code static analysis is passing.