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Description of problem:
there is no explanation for --major option in lvchange man page.

Version-Release number of selected component (if applicable):
lvm2-2.02.97-1.el7.x86_64

How reproducible:


Steps to Reproduce:
1. lvchange -h
====
	[-M|--persistent y|n] [--major major] [--minor minor]
====
2. man lvchange
I only see the --minor option but don't see the --major option in the manpage.
3.
  
Actual results:


Expected results:


Additional info:

--major option is not quite useful actually - with 2.6 kernels, we have dynamic major numbers so this option does not have any effect if used. We should probably consider removing this option OR issuing a suitable warning message + man page entry. There's also related bug #204997.