A little crash course in the use of "Markdown" when converting TXT files may also be helpful to you in future.
See Calibre User Manual
http://calibre-ebook.com/user_manual...-specific-tips
e.g. a short relevant snippet ...
Quote:
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Marking chapter headings with a leading # and setting the chapter XPath detection expression to “//h:h1” is the easiest way to have a proper table of contents generated from a TXT document.
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i.e. Set your conversion "chapter detection" to "//h:h1" and manually edit your TXT to be
Code:
# CHAPTER ONE
There was a faint smell ...
or if you prefer, set your conversion "chapter detection" to "//h:h2" and manually edit your TXT to be
Code:
## CHAPTER ONE
There was a faint smell ...
"Markdown" has lots of possibilities if you have some time to investigate.