diff --git a/docker/Dockerfile b/docker/Dockerfile
index 140e1d1..0717ad2 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -171,6 +171,8 @@ RUN useradd -m -s /bin/bash pyros_user --uid $uid
 
 # Create the work dir and set permissions as pyros_user 
 RUN mkdir -p /home/pyros_user/app/ && chown -R pyros_user:pyros_user /home/pyros_user/app
+
+# cd /home/pyros_user/app
 WORKDIR /home/pyros_user/app
 
 # Switch from root to pyros_user
@@ -181,6 +183,8 @@ USER pyros_user
 #RUN pip install --user numpy
 
 # Copy local host machine files to image
+# Dockerfile contains this volume => ../..:/home/pyros_user/app
+# Thus, this will copy PYROS_SOFT/* ==TO==> /home/pyros_user/app/ (the WORKDIR)
 COPY --chown=pyros_user:pyros_user . .
 # Copy some aliases
 RUN cp .bash_aliases ..
@@ -192,9 +196,9 @@ ENV PATH "$PATH:/home/pyros_user/.local/bin"
 
 
 # Installing click on the image to prevent error on the first execution of the installation script
-RUN python3 -m pip  install --user click
+RUN python3 -m pip install --user click
 
-RUN python3 -m pip  install --user setuptools==58
+RUN python3 -m pip install --user setuptools==58
 
 # (EP 23/3/2022) Installing pip-tools for the management of all the requirements*.txt files (python dependencies packages)
 # NB :
@@ -203,14 +207,14 @@ RUN python3 -m pip  install --user setuptools==58
 # - Unfortunatly, it is difficult to use with several requirements*.txt files as it is the case for this software : pyros + sphinx + guitastro...
 # - So we cannot yet use it completely and still have to use the traditional "pip install -r" anyway ...
 # - But we can at least use it to generate all the requirements*.txt files in a far better format
-RUN python3 -m pip  install --user pip-tools
+RUN python3 -m pip install --user pip-tools
 
 # Installing packages required for Guitastro
 RUN pip-compile ./vendor/guitastro/install/requirements.in 
-RUN python3 -m pip  install --user -r ./vendor/guitastro/install/requirements.txt
+RUN python3 -m pip install --user -r ./vendor/guitastro/install/requirements.txt
 # Maybe unnecessary because same requirements as for pyros requirements_dev (?)
 #RUN pip install --user -r ./vendor/guitastro/install/requirements_dev.txt
 
 # Installing packages required for PyROS
-RUN python3 -m pip  install --user -r ./install/requirements.txt
-RUN python3 -m pip  install --user -r ./install/requirements_dev.txt
+RUN python3 -m pip install --user -r ./install/requirements.txt
+RUN python3 -m pip install --user -r ./install/requirements_dev.txt
diff --git a/docker/PYROS_DOCKER_BUILD b/docker/PYROS_DOCKER_BUILD
index d588fca..0db3bc3 100755
--- a/docker/PYROS_DOCKER_BUILD
+++ b/docker/PYROS_DOCKER_BUILD
@@ -1,6 +1,7 @@
 #!/usr/bin/env bash
 
 # Git clone guitastro
+#
 # This could be done directly in the Dockerfile
 # but it is better to do it here because if it failed during the build 
 # we would have to do all the build again...
diff --git a/docker/docker-compose.yml b/docker/docker-compose.yml
index ad5b981..7f5a40f 100644
--- a/docker/docker-compose.yml
+++ b/docker/docker-compose.yml
@@ -111,6 +111,7 @@ services:
     tty: true
     # stdin_open is the -i option in docker exec
     stdin_open: true
+    # Local PYROS_SOFT/ folder is linked to container /home/pyros_user/app folder
     volumes:
       - ../..:/home/pyros_user/app
     # tells which port of local machine can communicate with the docker image (host:container), host is your local machine
--
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