Add vignettes
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+---
+title: add_footnote - PDF
+output: pdf_document
+vignette: >
+ %\VignetteIndexEntry{Use add_footnote in PDF document}
+ %\VignetteEngine{knitr::rmarkdown}
+ %\VignetteEncoding{UTF-8}
+---
+
+# Through Pandoc
+```{r through_pandoc}
+library(knitr)
+library(kableExtra)
+dt <- mtcars[1:5, 1:2]
+colnames(dt)[1] <- c("mpg[note]")
+rownames(dt)[2] <- c("Mazda RX4 Wag[note]")
+dt[3, 2] <- paste0(dt[3, 2], "[note]")
+
+kable(dt) %>%
+ add_footnote(c("footnote 1", "footnote 2", "footnote 3"))
+```
+
+# Through LaTeX
+## Plain LaTeX
+```{r through_latex_plain}
+kable(dt, format = "latex") %>%
+ add_footnote(c("footnote 1", "footnote 2", "footnote 3"))
+```
+
+## LaTeX + booktabs
+```{r through_latex_booktabs}
+kable(dt, format = "latex", booktabs = T) %>%
+ add_footnote(c("footnote 1", "footnote 2", "footnote 3"))
+```
+
+## LaTeX + longtable + booktabs
+Centered Table + page footnotes
+```{r through_latex_longtable}
+kable(dt, format = "latex", longtable = T, booktabs = T) %>%
+ add_footnote(c("footnote 1", "footnote 2", "footnote 3"))
+```