One more readme fix before forking

binder/README.md

@@ -4,6 +4,8 @@ This repository is set up to manage it's own jupyterhub but it can also run on a
 
 In that case, it is necessary to populate this folder with build instructions for binder. That could be a dockerfile or a requirement.txt file for pip or a conda environment. 
 
-It may be fine to make a link to the conda_packages file in the home directory but, if you need a different setup, this is the place to do it. 
+It seems to be fine to make a link from to the `conda_packages.yml` file in the home directory to `environment.yml` but, if you need a different setup, you can break that link and edit the environment file. 
 
-For information see ... on mybinder.org
+The packages file that is in the home directory has comments that are removed before use but binder does not do that so the `apt.txt` file here is a copy of what is likely to be needed. Watch out for this !
+
+For information see LINK on mybinder.org