Additional custom help text

How can I prepend/append custom (**bold**) text to the default one (*italics*)?
**Example**:
>>*MyTool 1.0.0.0
Copyright © My Company*
**... prepend any custom text here ...**
*--path Required. Path to file.
--major Required. Major version number. Must be int or {Function}.
--minor Required. Minor version number. Must be int or {Function}.
--build Required. Build version number. Must be int or {Function}.
--revision Required. Revision version number. Must be int or {Function}.
--logLevel (Default: Info) Info = silent, Debug = verbose.
--help Display this help screen.
--version Display version information.*
**... append any custom text here ...**