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-rw-r--r--lib/spack/spack/cmd/extensions.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/spack/spack/cmd/extensions.py b/lib/spack/spack/cmd/extensions.py
index 7e3db66384..e834d7fd18 100644
--- a/lib/spack/spack/cmd/extensions.py
+++ b/lib/spack/spack/cmd/extensions.py
@@ -37,7 +37,7 @@ def setup_parser(subparser):
subparser.add_argument(
'spec', nargs=argparse.REMAINDER,
- help='spec of package to list extensions for')
+ help='spec of package to list extensions for', metavar='extendable')
def extensions(parser, args):