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-rw-r--r--etc/spack/defaults/config.yaml5
1 files changed, 5 insertions, 0 deletions
diff --git a/etc/spack/defaults/config.yaml b/etc/spack/defaults/config.yaml
index f42a6525e2..535187a739 100644
--- a/etc/spack/defaults/config.yaml
+++ b/etc/spack/defaults/config.yaml
@@ -54,6 +54,11 @@ config:
# are that it precludes its use as a system package and its ability to be
# pip installable.
#
+ # In Spack environment files, chaining onto existing system Spack
+ # installations, the $env variable can be used to download, cache and build
+ # into user-writable paths that are relative to the currently active
+ # environment.
+ #
# In any case, if the username is not already in the path, Spack will append
# the value of `$user` in an attempt to avoid potential conflicts between
# users in shared temporary spaces.