diff --git a/docker/docker-compose.yml b/docker/docker-compose.yml
index 7f5a40f..b80bc9b 100644
--- a/docker/docker-compose.yml
+++ b/docker/docker-compose.yml
@@ -1,5 +1,6 @@
 version: "3.9"
 
+# Application name (group name for the 4 images composing the PyROS app)
 name: pyros-app
 
 services:
diff --git a/pyros.py b/pyros.py
index b480b7e..bc5fedd 100755
--- a/pyros.py
+++ b/pyros.py
@@ -587,9 +587,7 @@ def _install_or_update(UPDATE: bool = False, with_packages: bool = True, with_da
     # if WITH_DOCKER: only install the DB (with_database = True)
     if WITH_DOCKER:
         with_packages = False
-
     # if not with_packages and not with_database: with_packages = with_database = True
-
     print("- with_packages:", with_packages)
     print("- with_database:", with_database)
 
@@ -600,13 +598,14 @@ def _install_or_update(UPDATE: bool = False, with_packages: bool = True, with_da
     num = 0
 
     if UPDATE:
-        # Update source code (git pull)
+        # 1) Update source code (git pull)
         num += 1
         printFullTerm(Colors.BLUE, f"{num}) UPDATING SOURCE CODE: Running git pull")
         if not WITH_DOCKER:
             _gitpull() or die()
 
     if with_packages:
+        # 2) Install venv and packages in it
         # Update python packages (pip upgrade AND pip install requirements)
         num += 1
         printFullTerm(Colors.BLUE, f"{num}) {ACTION} PYTHON PACKAGES")
@@ -617,7 +616,7 @@ def _install_or_update(UPDATE: bool = False, with_packages: bool = True, with_da
     if UPDATE:
         print("Running UPDATE command")
     else:
-        # Install GitPython package for git support inside python
+        # 3) Install GitPython package for git support inside python
         print("Running INSTALL command")
         try:
             from git import Repo
@@ -644,59 +643,58 @@ def _install_or_update(UPDATE: bool = False, with_packages: bool = True, with_da
         change_dir("PREVIOUS")
         '''
 
-    #
-    # Guitastro
-    #
-    GUITASTRO_PATH = os.path.join(os.getcwd(), "./vendor/guitastro")
-    if with_packages:  # and not WITH_DOCKER:
-        #GUITASTRO_PATH = os.path.join(os.getcwd(), "../vendor/guitastro")
-        change_dir("..")
+    # 4) Install GUITASTRO + its requirements
+    # (ONLY FOR NON DOCKER INSTALL)
     print(os.getcwd())
-    # 1) clone repo if not yet done
-    if not WITH_DOCKER and not os.path.exists(GUITASTRO_PATH):
-        print("Guitastro : Cloning repository")
-        cloned_repo = Repo.clone_from(
-            "https://gitlab.irap.omp.eu/guitastrolib/guitastro.git", GUITASTRO_PATH)
-        print("Cloned successfully: ", cloned_repo.__class__ is Repo)
-    if UPDATE and os.path.exists(GUITASTRO_PATH) and and not WITH_DOCKER:
-        gitpull_guitastro()
-        change_dir("PREVIOUS")
-    # 2) install/update requirements & generate API doc
-    if not WITH_DOCKER and os.path.exists(GUITASTRO_PATH):
-        # TODO: update guitastro (git pull from vendor/guitastro/)
-        print("\nGuitastro : Installing/Updating python package dependencies\n")
-        # Upgrade pip if new version available
-        os.system(VENV_PYTHON + ' -m pip install --upgrade pip')
-        # TODO: faire les apt-get intall aussi (indi, ...)
-        venv_pip_install2(GUITASTRO_PATH + '/install/requirements.txt', '-r')
-        #venv_pip_install2(GUITASTRO_PATH + '/install/requirements_linux.txt', '-r')
-        venv_pip_install2(GUITASTRO_PATH + '/install/requirements_dev.txt', '-r')
-        '''
-        print("Guitastro : Generating (updating) API documentation (using Sphinx)")
-        # Make html doc from RST
-        # cd doc/sourcedoc/
-        change_dir(GUITASTRO_PATH + '/doc_rst/')
-        # ./MAKE_DOC.sh
-        res = execProcess('/bin/bash MAKE_DOC.sh')
-        # Come back to where we were before
-        # cd -
-        change_dir("PREVIOUS")
-        '''
-
-
-    # 3) Update PlantUML diagrams
+    if not WITH_DOCKER:
+        GUITASTRO_PATH = os.path.join(os.getcwd(), "./vendor/guitastro")
+        if with_packages:
+            change_dir("..")
+            print(os.getcwd())
+        if not os.path.exists(GUITASTRO_PATH):
+            # a) clone repo if not yet done
+            print("Guitastro : Cloning repository")
+            cloned_repo = Repo.clone_from(
+                "https://gitlab.irap.omp.eu/guitastrolib/guitastro.git", GUITASTRO_PATH)
+            print("Cloned successfully: ", cloned_repo.__class__ is Repo)
+        if os.path.exists(GUITASTRO_PATH):
+            if UPDATE:
+                gitpull_guitastro()
+                change_dir("PREVIOUS")
+            # b) install/update requirements & generate API doc
+            # TODO: update guitastro (git pull from vendor/guitastro/)
+            print("\nGuitastro : Installing/Updating python package dependencies\n")
+            # Upgrade pip if new version available
+            os.system(VENV_PYTHON + ' -m pip install --upgrade pip')
+            # TODO: faire les apt-get intall aussi (indi, ...)
+            venv_pip_install2(GUITASTRO_PATH + '/install/requirements.txt', '-r')
+            #venv_pip_install2(GUITASTRO_PATH + '/install/requirements_linux.txt', '-r')
+            venv_pip_install2(GUITASTRO_PATH + '/install/requirements_dev.txt', '-r')
+            '''
+            print("Guitastro : Generating (updating) API documentation (using Sphinx)")
+            # Make html doc from RST
+            # cd doc/sourcedoc/
+            change_dir(GUITASTRO_PATH + '/doc_rst/')
+            # ./MAKE_DOC.sh
+            res = execProcess('/bin/bash MAKE_DOC.sh')
+            # Come back to where we were before
+            # cd -
+            change_dir("PREVIOUS")
+            '''
+
+    # 5) Update PlantUML diagrams
     num += 1
     printFullTerm(Colors.BLUE, f"{num}) UPDATING UML DIAGRAMS")
     _update_plantuml_diags() or die()
     print(os.getcwd())
 
-    # 4) Update Sphinx API doc
+    # 6) Update Sphinx API doc (Non Windows only)
     num += 1
     printFullTerm(Colors.BLUE, f"{num}) UPDATING API DOC (with Sphinx)")
     if not IS_WINDOWS:
         _update_api_doc() or die()
 
-    # 5) Install/Update database structure (make migrations + migrate)
+    # 7) Install/Update database structure (make migrations + migrate)
     if with_database:
         num += 1
         printFullTerm(Colors.BLUE, f"{num}) {ACTION} DATABASE")
--
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