diff --git a/tests/base.py b/tests/base.py
index e43387ab..5d96741d 100644
--- a/tests/base.py
+++ b/tests/base.py
@@ -6,6 +6,9 @@
 If running on Cori, it is preferable to run from $CSCRATCH rather than
 /global/homes. Running from the latter may result in a
 'Resource temporarily unavailable' error.
+
+If running on Compy, it is necessary to run test_globus.py from a
+sub-directory of /compyfs rather than /qfs.
 """
 
 import os