# Customization of the `highr` package If you are not satisfied with the default syntax highlighting commands in the **highr** package, you can just use your own tags/commands. In this vignette, we show a brief example. The default highlighting commands are stored in two internal data frames `cmd_latex` and `cmd_html`: ```{r} library(highr) highr:::cmd_latex ``` This data frame is passed to the `markup` argument in `hilight()`, so we are free to pass a modified version there. Suppose I want to use the command `\my<*>` instead of `\hl<*>`: ```{r} m = highr:::cmd_latex m[, 1] = sub('\\hl', '\\my', m[, 1], fixed = TRUE) head(m) ``` Then ```{r} hilight("x = 1+1 # a comment") # default markup hilight("x = 1+1 # a comment", markup = m) # custom markup ``` This allows one to use arbitrary commands around the text symbols in the R code. See for how `cmd_latex` and `cmd_html` were generated in **highr**.