diff --git a/openappstack/__main__.py b/openappstack/__main__.py
index 084ae370307dfaaa4804657cfdc62a6c3794bff7..d68a9a9bab65858ed6adb6cd3bf3feb809937697 100755
--- a/openappstack/__main__.py
+++ b/openappstack/__main__.py
@@ -211,7 +211,7 @@ def main():  # pylint: disable=too-many-statements,too-many-branches,too-many-lo
     test_parser.add_argument(
         '--behave-ignore-certificate-errors',
         action='store_true',
-        help=('Ignore certificate errors, needed if you uses ACME staging'))
+        help=('Ignore certificate errors, needed if you use i.e. the Letsencrypt ACME staging CA'))
     test_parser.add_argument(
         '--behave-param',
         metavar=['PARAM[=VALUE]'],