diff --git a/.github/workflows/run_tests.yaml b/.github/workflows/run_tests.yaml
index 5ca93a36..38d40e0a 100644
--- a/.github/workflows/run_tests.yaml
+++ b/.github/workflows/run_tests.yaml
@@ -1,9 +1,47 @@
 name: Run tests
-on: [push, pull_request]
+
+# This GitHub Actions workflow is designed to automate testing for the project.
+# It triggers under two conditions:
+# 1. Pull requests targeting the main branch, ensuring that internal changes
+#    are validated before merging.
+# 2. Pushes to the dev branch, allowing for continuous integration
+#    as changes are made directly to the development branch.
+#
+# The workflow consists of three main jobs:
+# - **test-tools**: Runs tests for tools extracted from the repository.
+# - **test-tutorials**: Runs tests for community tutorials.
+# - **test-workflows**: Runs tests for workflow scripts.
+#
+# Each job includes the following steps:
+# - Checkout the repository code.
+# - Set up the Python environment using the specified version.
+# - Install required dependencies.
+# - Execute scripts for extraction and filtering of tools, tutorials, or workflows.
+#
+# This ensures that the code remains reliable and functional as new changes are introduced.
+
+on:
+  pull_request:
+    branches:
+      - main  # Trigger on pull requests targeting the main branch
+  push:
+    branches:
+      - dev  # Trigger on pushes to the dev branch
 
 jobs:
   test-tools:
     runs-on: ubuntu-20.04
+    # This job runs tests for tools.
+    # It checks for internal pull requests targeting the main branch,
+    # as well as pushes to the dev branch.
+    # The workflow performs the following steps:
+    # 1. Checkout the repository code.
+    # 2. Set up Python environment using the specified version.
+    # 3. Install required Python packages.
+    # 4. Extract tools using a provided script.
+    # 5. Filter community tools using a provided script.
+    # 6. Format tools into an interactive table and generate a word cloud.
+    if: github.event.pull_request.head.repo.full_name == github.repository || github.ref == 'refs/heads/dev'
     strategy:
       matrix:
         python-version: ['3.11']
@@ -14,7 +52,7 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
-      - name: Install requirement
+      - name: Install requirements
         run: python -m pip install -r requirements.txt
       - name: Tool extraction
         run: | 
@@ -27,8 +65,19 @@ jobs:
       - name: Create interactive table and wordcloud
         run: | 
           bash sources/bin/format_tools.sh
+
   test-tutorials:
     runs-on: ubuntu-20.04
+    # This job runs tests for tutorials.
+    # Similar to the tools job, it checks for internal pull requests
+    # to the main branch and pushes to the dev branch.
+    # The workflow performs the following steps:
+    # 1. Checkout the repository code.
+    # 2. Set up Python environment using the specified version.
+    # 3. Install required Python packages.
+    # 4. Extract tutorials using a provided script.
+    # 5. Filter community tutorials using a provided script.
+    if: github.event.pull_request.head.repo.full_name == github.repository || github.ref == 'refs/heads/dev'
     strategy:
       matrix:
         python-version: ['3.11']
@@ -38,7 +87,7 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
-      - name: Install requirement
+      - name: Install requirements
         run: python -m pip install -r requirements.txt
       - name: Tutorial extraction
         run: | 
@@ -48,8 +97,13 @@ jobs:
       - name: Tutorial filtering
         run: | 
           bash sources/bin/get_community_tutorials.sh test
+
   test-workflows:
     runs-on: ubuntu-20.04
+    # This job runs tests for workflows.
+    # It performs the same checks as the other jobs, ensuring
+    # quality for workflow scripts.
+    if: github.event.pull_request.head.repo.full_name == github.repository || github.ref == 'refs/heads/dev'
     strategy:
       matrix:
         python-version: ['3.11']
@@ -59,7 +113,7 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
-      - name: Install requirement
+      - name: Install requirements
         run: python -m pip install -r requirements.txt
       - name: Workflow extraction
         run: | 
diff --git a/sources/README.md b/sources/README.md
index 6d353ea7..53b7bd16 100644
--- a/sources/README.md
+++ b/sources/README.md
@@ -202,6 +202,20 @@ $ python sources/bin/create_interactive_table.py \
 
 ## Development
 
+### Contributing
+
+To contribute to the CoDex Source code:
+1. fork the repository,
+2. create a branch and add your changes
+3. make a pull request to the **dev branch** of the CoDex repository. 
+
+Upon review the maintainer will merge your pull request. 
+Automatic tests will run on the dev branch. 
+
+When the tests succeed a maintainer will merge the dev branch into main. Feel free to ping the maintainers to speed up the process.
+
+The reason we are not running the tests directly on the pull request branch is, that this does not allow to access the GitHub secrets, that are required to run the tests.
+
 ### Tools
 
 To make a test run of the tool to check its functionalities follow [Usage](#Usage) to set-up the environnement and the API key, then run