added docs for xtable
diff --git a/docs/xtable.Rmd b/docs/xtable.Rmd
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+---
+title: "xtable & kableExtra"
+author: "Hao"
+date: "2/13/2019"
+output: pdf_document
+---
+
+```{r setup, include=FALSE}
+knitr::opts_chunk$set(message = FALSE)
+```
+
+Recent versions of kableExtra (since 1.0) offers a function `xtable2kable`, which, as suggested by its name, turns a `xtable` object to a `kable` object so you can use functions in kableExtra after that. I tested some basic examples and it seem to work.
+
+```{r}
+library(xtable)
+library(kableExtra)
+
+xtable(mtcars[1:5, 1:5]) %>%
+ xtable2kable() %>%
+ column_spec(1, width = "5cm")
+```
+
+```{r}
+xtable(mtcars[1:5, 1:5], caption = "Some long caption") %>%
+ xtable2kable(caption.width = "10em") %>%
+ column_spec(1, color = "red")
+```
+
+
+