Testing a warning section about an old CVMFS path.

docs/usage.md

@@ -25,7 +25,12 @@ as follows:
 source /cvmfs/oasis.opensciencegrid.org/ligo/sw/conda/etc/profile.d/conda.sh
 ```
 
-The you should be able to run `conda --help` and other commands to start
+{: .alert .alert-warning}
+Note that old versions of this command used `/cvmfs/ligo-containers.opensciencegrid.org/`,
+but that that resource is no longer available.  (It will give an error saying
+`No such file or directory`.)
+
+Then you should be able to run `conda --help` and other commands to start
 working with conda.
 
 !!! tip "Add this to `.bashrc` (or similar)"