diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index a921b5c..d440d57 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -27,7 +27,7 @@ repos:
         types: [file, python]
 
   - repo: https://github.com/pycqa/isort
-    rev: 5.9.3
+    rev: 5.10.0
     hooks:
       - id: isort
         args: ["--profile", "black", "--filter-files"]
@@ -38,5 +38,6 @@ repos:
       - id: flake8
         language: python
         files: ^gml_application_schema_toolbox/.*\.py$
-        types: [python]
+        additional_dependencies: ["flake8-annotations<3", "flake8-docstrings<2"]
         args: ["--config=setup.cfg", "--select=E9,F63,F7,F82"]
+        types: [python]
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 7c555e3..83fb080 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,6 +1,6 @@
 # Contributing Guidelines
 
-:+1::tada: First off, thanks for considering to contribute to this project! :tada::+1:
+First off, thanks for considering to contribute to this project!
 
 These are mostly guidelines, not rules. Use your best judgment, and feel free to propose changes to this document in a pull request.
 
@@ -17,3 +17,18 @@ Make sure your code *roughly* follows [PEP-8](https://www.python.org/dev/peps/pe
 - docstrings: [sphinx-style](https://sphinx-rtd-tutorial.readthedocs.io/en/latest/docstrings.html#the-sphinx-docstring-format) is used to write technical documentation.
 - formatting: [black](https://black.readthedocs.io/) is used to automatically format the code without debate.
 - static analisis: [flake8](https://flake8.pycqa.org/en/latest/) is used to catch some dizziness and keep the source code healthy.
+- static typing: following [PEP-484](https://www.python.org/dev/peps/pep-0484/) type annotations are used to improve code readability and reliability.
+
+----
+
+## Git flow
+
+### Branches naming pattern
+
+The pattern is: `{category}/{issue-code}_-_{slugified-description}`. Where:
+
+- `category` is the type of work. Can be: `feature`, `bug`, `tooling`, `refactor`, `test`, `chore`, `release`, `hotfix`, `docs`, `ci`, `deploy` or `release-candidate`.
+- `issue-code` is the GitHub issue number followed by an underscore. If it's not relevant, ignore this.
+- `slugified-description` is the description of the work, slugified.
+
+Example: `feature/137_content_negociation`
diff --git a/requirements/development.txt b/requirements/development.txt
index f0846d7..6ac41a7 100644
--- a/requirements/development.txt
+++ b/requirements/development.txt
@@ -3,7 +3,9 @@
 
 black
 flake8>=3.8,<4.1
+flake8-annotations<2.8
 flake8-builtins>=1.5,<1.6
+flake8-docstrings<1.7
 flake8-eradicate>=1.0,<1.3
 flake8-isort>=4.0,<4.2
 pre-commit>=2.12,<2.16
diff --git a/setup.cfg b/setup.cfg
index eb2f7b6..4df5ae7 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -32,7 +32,7 @@ exclude =
     tests,
     # do not consider external packages
     */external/*, ext_libs/*
-ignore = E121,E123,E126,E203,E226,E24,E704,W503,W504
+ignore = ANN101, ANN102, D104, D400, D401, E121,E123,E126,E203,E226,E24,E704,W503,W504
 max-complexity = 15
 max-doc-length = 130
 max-line-length = 100