#16940: fix indentation in example.
diff --git a/Doc/library/argparse.rst b/Doc/library/argparse.rst
index ca48f35..d18b51b 100644
--- a/Doc/library/argparse.rst
+++ b/Doc/library/argparse.rst
@@ -1486,8 +1486,8 @@
 
      positional arguments:
        {a,b}   sub-command help
-     a     a help
-     b     b help
+         a     a help
+         b     b help
 
      optional arguments:
        -h, --help  show this help message and exit