diff --git a/docs/contribution_guide.md b/docs/contribution_guide.md
index 0ba661f2..21a4ab11 100644
--- a/docs/contribution_guide.md
+++ b/docs/contribution_guide.md
@@ -11,7 +11,8 @@ way, feel free to contribute.
 
 ### Prepare environment
 * run `docker-compose up firefox`, then a instance of selenium in your 
-[localhost:4444](http://localhost:4444/wd/hub/static/resource/hub.html) will be available
+[localhost:4444](http://localhost:4444/wd/hub/static/resource/hub.html) will be available.  
+  If "docker-compose up firefox" command fails try to replace "image: selenium/standalone-firefox-debug:3.14.0-curium" by "image: selenium/standalone-firefox-debug:latest" in docker-compose.yml file.
 * open your vnc client in localhost:5900, it will ask for a password that is `secret`
 
 ### Run project
@@ -25,4 +26,4 @@ way, feel free to contribute.
 
 ### Commit standardization
 Please, use our tool `utils/commit.sh` to make commits more standardized
-* To apply [black](https://github.com/psf/black) style: `black .`
\ No newline at end of file
+* To apply [black](https://github.com/psf/black) style: `black .`