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-rw-r--r--ch1p/functions.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/ch1p/functions.py b/ch1p/functions.py
index cf75221..7cc2a10 100644
--- a/ch1p/functions.py
+++ b/ch1p/functions.py
@@ -13,7 +13,7 @@ def _get_vars(params: List[Tuple], kw: dict) -> List[AnyStr]:
elif env_name in os.environ:
result.append(os.environ[env_name])
else:
- raise RuntimeError("missing parameter %s or variable %s" % (kw_name, env_name))
+ raise RuntimeError("missing parameter '%s' or variable '%s'" % (kw_name, env_name))
return result