diff --git a/.evergreen/start-orchestration.sh b/.evergreen/start-orchestration.sh
index 16877b04..af313439 100755
--- a/.evergreen/start-orchestration.sh
+++ b/.evergreen/start-orchestration.sh
@@ -35,6 +35,8 @@ venvcreate "${PYTHON:?}" venv
 echo "Creating virtual environment 'venv'... done."
 
 # Install from github to get the latest mongo-orchestration, fall back on published wheel.
+# The fallback was added to accommodate RHEL 7.0, whose version of glibc does not support the
+# hatchling backend used by mongo-orchestration.
 python -m pip install -q --upgrade 'https://github.com/mongodb/mongo-orchestration/archive/master.tar.gz' || python -m pip install -q --upgrade mongo-orchestration
 python -m pip list
 cd $DRIVERS_TOOLS