diff --git a/docs/awesome_table_in_pdf.Rmd b/docs/awesome_table_in_pdf.Rmd
index f1f0f78..9e5d351 100644
--- a/docs/awesome_table_in_pdf.Rmd
+++ b/docs/awesome_table_in_pdf.Rmd
@@ -14,6 +14,10 @@
   - \usepackage[table]{xcolor}
   - \usepackage{wrapfig}
   - \usepackage{float}
+  - \usepackage{colortbl}
+  - \usepackage{pdflscape}
+  - \usepackage{tabu}
+  - \usepackage{threeparttable}
 vignette: >
   %\VignetteIndexEntry{Create Awesome PDF Table with knitr::kable and kableExtra}
   %\VignetteEngine{knitr::rmarkdown}
@@ -44,7 +48,7 @@
 dt <- mtcars[1:5, 1:6]
 ```
 
-When you are using `kable()`, if you don't specify `format`, by default it will generate a markdown table and let pandoc handle the conversion from markdown to HTML/PDF. This is the most favorable approach to render most simple tables as it is format independent. If you switch from HTML to pdf, you basically don't need to change anything in your code. However, markdown doesn't support complex table. For example, if you want to have a double-row header table, markdown just cannot provide you the functionality you need. As a result, when you have such a need, you should **define `format` in `kable()`** as either "html" or "latex". *You can also define a global option at the beginning using `options(knitr.table.format = "latex")` so you don't repeat the step everytime.*
+When you are using `kable()`, if you don't specify `format`, by default it will generate a markdown table and let pandoc handle the conversion from markdown to HTML/PDF. This is the most favorable approach to render most simple tables as it is format independent. If you switch from HTML to pdf, you basically don't need to change anything in your code. However, markdown doesn't support complex table. For example, if you want to have a double-row header table, markdown just cannot provide you the functionality you need. As a result, when you have such a need, you should **define `format` in `kable()`** as either "html" or "latex". *You can also define a global option at the beginning using `options(knitr.table.format = "latex")` so you don't repeat the step everytime.* **In this tutorial, I'll still put `format="latex"` in the function in case users just want to quickly replicate the results.** 
 
 ```{r}
 options(knitr.table.format = "latex") 
@@ -52,6 +56,30 @@
 ## in every kable function.
 ```
 
+# LaTeX packages used in this package
+If you are using a recent version of rmarkdown, you are recommended to load this package entirely via `library(kableExtra)` or `require(kableExtra)` because this package will load all necessary LaTeX packages, such as `booktabs` or `multirow`, for you automatically. Note that, if you are calling functions from `kableExtra` via `kableExtra::kable_styling()` or if you put `library(kableExtra)` in a separate R file that is **sourced** by the rmarkdown document, these packages won't be loaded. Furthermore, you can suppress this auto-loading behavior by setting a global option `kableExtra.latex.load_packages` to be `FALSE` before you load `kableExtra`.
+
+```
+options(kableExtra.latex.load_package = FALSE)
+```
+
+If you are using R Sweave or some customized rmarkdown templates or you just want to load these LaTeX libraries by yourself, you can put the following meta data into the `yaml` section. If you are familar with LaTeX and you know what you are doing, feel free to remove unnecessary packages from the list. 
+
+```
+header-includes:
+  - \usepackage{booktabs}
+  - \usepackage{longtable}
+  - \usepackage{array}
+  - \usepackage{multirow}
+  - \usepackage[table]{xcolor}
+  - \usepackage{wrapfig}
+  - \usepackage{float}
+  - \usepackage{colortbl}
+  - \usepackage{pdflscape}
+  - \usepackage{tabu}
+  - \usepackage{threeparttable}
+```
+
 ## Plain LaTeX
 Plain LaTeX table looks relatively ugly in 2017.
 ```{r}
@@ -61,7 +89,7 @@
 ## LaTeX table with booktabs
 Similar with Bootstrap in HTML, in LaTeX, you can also use a trick to make your table look prettier as well. The different part is that, this time you don't need to pipe kable outputs to another function. Instead, you should call `booktabs = T` directly in `kable()`
 ```{r}
-kable(dt, booktabs = T)
+kable(dt, format = "latex", booktabs = T)
 ```
 
 # Table Styles
@@ -73,25 +101,25 @@
 ### Striped
 Even though in the LaTeX world, people usually call it `alternative row colors` but here I'm using its bootstrap name for consistency. Note that to make it happen, LaTeX package `xcolor` is required to be loaded. In an environment like rmarkdown::pdf_document (rmarkdown 1.4.0 +), `kable_styling` will load it automatically if `striped` is enabled. However, in other cases, you probably need to import that package by yourself. 
 ```{r}
-kable(dt, booktabs = T) %>%
+kable(dt, format = "latex", booktabs = T) %>%
   kable_styling(latex_options = "striped")
 ```
 
 ### Hold position
 If you provide a table caption in `kable()`, it will put your LaTeX tabular in a `table` environment, unless you are using `longtable`. A `table` environment will automatically find the best place (it thinks) to put your table. However, in many cases, you do want your table to appear in a position you want it to be. In this case, you can use this `hold_position` options here.
 ```{r}
-kable(dt, caption = "Demo table", booktabs = T) %>%
+kable(dt, format = "latex", caption = "Demo table", booktabs = T) %>%
   kable_styling(latex_options = c("striped", "hold_position"))
 ```
 
 ### Scale down
 When you have a wide table that will normally go out of the page and you want to scale down the table to fit the page, you can use the `scale_down` option here. Note that, if your table is too small, it will also scale up your table. It was named in this way only because scaling up isn't very useful in most cases. 
 ```{r}
-kable(cbind(dt, dt, dt), booktabs = T) %>%
+kable(cbind(dt, dt, dt), format = "latex", booktabs = T) %>%
   kable_styling(latex_options = c("striped", "scale_down"))
 ```
 ```{r}
-kable(cbind(dt), booktabs = T) %>%
+kable(cbind(dt), format = "latex", booktabs = T) %>%
   kable_styling(latex_options = c("striped", "scale_down"))
 ```
 
@@ -100,7 +128,7 @@
 ```{r}
 long_dt <- rbind(mtcars, mtcars) 
 
-kable(long_dt, longtable = T, booktabs = T, caption = "Longtable") %>%
+kable(long_dt, format = "latex", longtable = T, booktabs = T, caption = "Longtable") %>%
   add_header_above(c(" ", "Group 1" = 5, "Group 2" = 6)) %>%
   kable_styling(latex_options = c("repeat_header"))
 ```
@@ -109,7 +137,7 @@
 ## Full width?
 If you have a small table and you want it to spread wide on the page, you can try the `full_width` option. Unlike `scale_down`, it won't change your font size. Note that, if you use `full_width` in LaTeX, you will loss your in-cell text alignment settings and everything will be left-aligned. 
 ```{r}
-kable(dt, booktabs = T) %>%
+kable(dt, format = "latex", booktabs = T) %>%
   kable_styling(full_width = T)
 ```
 
@@ -118,13 +146,13 @@
 
 Note that even though you can select to `right` align your table but the table will actually be centered. Somehow it is very difficult to right align a table in LaTeX (since it's not very useful in the real world?). If you know how to do it, please send out an issue or PR and let me know. 
 ```{r}
-kable(dt, booktabs = T) %>%
+kable(dt, format = "latex", booktabs = T) %>%
   kable_styling(position = "center")
 ```
 
 Becides these three common options, you can also wrap text around the table using the `float-left` or `float-right` options. Note that, like `striped`, this feature will load another non-default LaTeX package `wrapfig` which requires rmarkdown 1.4.0 +. If you rmarkdown version < 1.4.0, you need to load the package through a customed LaTeX template file. 
 ```{r}
-kable(dt, booktabs = T) %>%
+kable(dt, format = "latex", booktabs = T) %>%
   kable_styling(position = "float_right")
 ```
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@@ -132,7 +160,7 @@
 ## Font Size
 If one of your tables is huge and you want to use a smaller font size for that specific table, you can use the `font_size` option. 
 ```{r}
-kable(dt, booktabs = T) %>%
+kable(dt, format = "latex", booktabs = T) %>%
   kable_styling(font_size = 7)
 ```
 
@@ -149,7 +177,7 @@
   )
 )
 
-kable(text_tbl, booktabs = T) %>%
+kable(text_tbl, format = "latex", booktabs = T) %>%
   kable_styling(full_width = F) %>%
   column_spec(1, bold = T) %>%
   column_spec(2, width = "30em")
@@ -159,7 +187,7 @@
 Similar with `column_spec`, you can define specifications for rows. Currently, you can either bold or italiciz an entire row. Note that, similar with other row-related functions in `kableExtra`, for the position of the target row, you don't need to count in header rows or the group labelling rows.
 
 ```{r}
-kable(dt, booktabs = T) %>%
+kable(dt, format = "latex", booktabs = T) %>%
   kable_styling("striped", full_width = F) %>%
   column_spec(7, bold = T) %>%
   row_spec(5, bold = T)
@@ -169,14 +197,14 @@
 ## Add header rows to group columns
 Tables with multi-row headers can be very useful to demonstrate grouped data. To do that, you can pipe your kable object into `add_header_above()`. The header variable is supposed to be a named character with the names as new column names and values as column span. For your convenience, if column span equals to 1, you can ignore the `=1` part so the function below can be written as `add_header_above(c(" ", "Group 1" = 2, "Group 2" = 2, "Group 3" = 2)).
 ```{r}
-kable(dt, booktabs = T) %>%
+kable(dt, format = "latex", booktabs = T) %>%
   kable_styling() %>%
   add_header_above(c(" " = 1, "Group 1" = 2, "Group 2" = 2, "Group 3" = 2))
 ```
 
 In fact, if you want to add another row of header on top, please feel free to do so. Also, in kableExtra 0.3.0, you can specify `bold` & `italic` as you do in `row_spec()`.
 ```{r}
-kable(dt, booktabs = T) %>%
+kable(dt, format = "latex", booktabs = T) %>%
   kable_styling(latex_options = "striped") %>%
   add_header_above(c(" ", "Group 1" = 2, "Group 2" = 2, "Group 3" = 2)) %>%
   add_header_above(c(" ", "Group 4" = 4, "Group 5" = 2)) %>%
@@ -186,7 +214,7 @@
 ## Group rows via labeling
 Sometimes we want a few rows of the table being grouped together. They might be items under the same topic (e.g., animals in one species) or just different data groups for a categorical variable (e.g., age < 40, age > 40). With the new function `group_rows()` in `kableExtra`, this kind of task can be completed in one line. Please see the example below. Note that when you count for the start/end rows of the group, you don't need to count for the header rows nor other group label rows. You only need to think about the row numbers in the "original R dataframe".
 ```{r}
-kable(mtcars[1:10, 1:6],"latex", caption = "Group Rows", booktabs = T) %>%
+kable(mtcars[1:10, 1:6], format = "latex", caption = "Group Rows", booktabs = T) %>%
   kable_styling() %>%
   group_rows("Group 1", 4, 7) %>%
   group_rows("Group 2", 8, 10)
@@ -194,7 +222,7 @@
 
 In case some users need it, you can define your own gapping spaces between the group labeling row and previous rows. The default value is `0.5em`.
 ```{r}
-kable(dt, booktabs = T) %>%
+kable(dt, format = "latex", booktabs = T) %>%
   group_rows("Group 1", 4, 5, latex_gap_space = "2em")
 ```
 
@@ -202,7 +230,7 @@
 Unlike `group_rows()`, which will insert a labeling row, sometimes we want to list a few sub groups under a total one. In that case, `add_indent()` is probably more apporiate. 
 For advanced users, you can even define your own css for the group labeling.
 ```{r}
-kable(dt, booktabs = T) %>%
+kable(dt, format = "latex", booktabs = T) %>%
   add_indent(c(1, 3, 5))
 ```
 
@@ -214,13 +242,13 @@
                  C2 = c(rep("c", 7), rep("d", 3), rep("c", 2), rep("d", 3)),
                  C3 = 1:15,
                  C4 = sample(c(0,1), 15, replace = TRUE))
-kable(collapse_rows_dt, "latex", booktabs = T, align = "c") %>%
+kable(collapse_rows_dt, format = "latex", booktabs = T, align = "c") %>%
   column_spec(1, bold=T) %>%
   collapse_rows(columns = 1:2)
 ```
 
 ```{r}
-kable(collapse_rows_dt, "latex", align = "c") %>%
+kable(collapse_rows_dt, format = "latex", align = "c") %>%
   column_spec(1, bold = T, width = "5em") %>%
   collapse_rows(1:2)
 ```
@@ -231,21 +259,21 @@
 
 ### Alphabet
 ```{r}
-kable(dt, booktabs = T) %>%
+kable(dt, format = "latex", booktabs = T) %>%
   kable_styling() %>%
   add_footnote(c("Footnote 1", "Have a good day."), notation = "alphabet")
 ```
 
 ### Number
 ```{r}
-kable(dt, booktabs = T) %>%
+kable(dt, format = "latex", booktabs = T) %>%
   kable_styling() %>%
   add_footnote(c("Footnote 1", "Have a good day."), notation = "number")
 ```
 
 ### Symbol
 ```{r}
-kable(dt, booktabs = T) %>%
+kable(dt, format = "latex", booktabs = T) %>%
   kable_styling() %>%
   add_footnote(c("Footnote 1", "Footnote 2", "Footnote 3"), notation = "symbol")
 ```
@@ -253,7 +281,7 @@
 ## In-table markers
 By design, `add_footnote()` will transform any `[note]` to in-table footnote markers. 
 ```{r}
-kable(dt, caption = "Demo Table[note]", booktabs = T) %>%
+kable(dt, format = "latex", caption = "Demo Table[note]", booktabs = T) %>%
   kable_styling(latex_options = "hold_position") %>%
   add_header_above(c(" ", "Group 1[note]" = 3, "Group 2[note]" = 3)) %>%
   add_footnote(c("This table is from mtcars", 
@@ -266,7 +294,7 @@
 ## Table on a Landscape Page
 Sometimes when we have a wide table, we want it to sit on a designated landscape page. The new function `landscape()` can help you on that. Unlike other functions, this little function only serves LaTeX and doesn't have a HTML side.
 ```{r}
-kable(dt, caption = "Demo Table (Landscape)[note]", booktabs = T) %>%
+kable(dt, format = "latex", caption = "Demo Table (Landscape)[note]", booktabs = T) %>%
   kable_styling(latex_options = c("hold_position")) %>%
   add_header_above(c(" ", "Group 1[note]" = 3, "Group 2[note]" = 3)) %>%
   add_footnote(c("This table is from mtcars", 
diff --git a/docs/awesome_table_in_pdf.pdf b/docs/awesome_table_in_pdf.pdf
index 661108b..add627c 100644
--- a/docs/awesome_table_in_pdf.pdf
+++ b/docs/awesome_table_in_pdf.pdf
Binary files differ