Add note about stages

README.md

@@ -85,6 +85,10 @@ To add a new trigger for another project:
         - master
     ```
+      >**Note:**
+      Every project might have different stages, make sure to add it to one that
+      makes sense, for example after all builds successfully pass.
+
 [contributing]: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#merge-request-guidelines
 [doc-styleguide]: https://docs.gitlab.com/ce/development/doc_styleguide.html
 [job]: https://gitlab.com/gitlab-org/gitlab-ce/blob/2c00d00ec1c39dbea0e0e54265027b5476b78e3c/.gitlab-ci.yml#L308-318