From 8a0de10f60ead1398419257fc2efa37a9bc24b3c Mon Sep 17 00:00:00 2001
From: Matthew Chan <talcite@gmail.com>
Date: Thu, 12 Oct 2023 23:59:44 -0700
Subject: containerize: update docs to activate env before using container
 templates (#40493)

---
 lib/spack/docs/containers.rst | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/spack/docs/containers.rst b/lib/spack/docs/containers.rst
index 17609d740e..64ca1df926 100644
--- a/lib/spack/docs/containers.rst
+++ b/lib/spack/docs/containers.rst
@@ -519,6 +519,13 @@ the example below:
    COPY data /share/myapp/data
    {% endblock %}
 
+The Dockerfile is generated by running:
+
+.. code-block:: console
+
+   $ spack -e /opt/environment containerize
+
+Note that the environment must be active for spack to read the template.
 The recipe that gets generated contains the two extra instruction that we added in our template extension:
 
 .. code-block:: Dockerfile
-- 
cgit v1.2.3-70-g09d2