---
title: "R Notebook"
output:
html_notebook:
toc: yes
---
# first level 1 heading
bla bla bla
# second level 1 heading
## first level 2 heading under second level 1 heading
bla bla bla
## second level 2 heading under second level 1 heading
bla bla bla
your screenshot imply this paged is generated by Knit, so this html is NOT generated automatically. every time you want to preview, you need to generate this manually by clicking Knit. is it?
it is weird. if i don't include toc: true, each time i refresh the .nb.html, the change i made in rmd file get synched. if i include toc: true, the nb.html does not change anymore, i have to Knit it manually. what i am missing?