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-rw-r--r--coverage/cmdline.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/coverage/cmdline.py b/coverage/cmdline.py
index ec809330..002a8e44 100644
--- a/coverage/cmdline.py
+++ b/coverage/cmdline.py
@@ -44,7 +44,7 @@ class Opts:
'', '--concurrency', action='store', metavar="LIBS",
help=(
"Properly measure code using a concurrency library. " +
- "Valid values are: {}."
+ "Valid values are: {}, or a comma-list of them."
).format(", ".join(sorted(CoverageConfig.CONCURRENCY_CHOICES))),
)
context = optparse.make_option(