It might be that the manpage was not updated since v2.2. Version 3.1.0, however, has the issue fixed. A possible solution would be to backport the manpage from v3.1.0, but then one should take care not to describe features appearing specifically in v3.1.0.
The issue originates in the original upstream tarball:
https:/ /github. com/openbabel/ openbabel/ blob/49f9cfb32b d0bc6ea440639d3 38123eb27accbe2 /doc/babel. 1
It might be that the manpage was not updated since v2.2. Version 3.1.0, however, has the issue fixed. A possible solution would be to backport the manpage from v3.1.0, but then one should take care not to describe features appearing specifically in v3.1.0.