diff --git a/docs/awesome_table_in_html.Rmd b/docs/awesome_table_in_html.Rmd
index 7f5e00d..14e5584 100644
--- a/docs/awesome_table_in_html.Rmd
+++ b/docs/awesome_table_in_html.Rmd
@@ -227,3 +227,14 @@
   column_spec(7, bold = T) %>%
   row_spec(5, bold = T)
 ```
+
+# Add header column to the left
+An alternative way of grouping rows is being added to `kableExtra` 0.3.0. Unlike `group_rows`, the new function `add_header_left` adopts a similar syntax with `add_header_above`. It allows users to add multiple layers of row groups, which is a limitation of `group_rows`. Currently, `add_header_left` in HTML is in good shape with exception that it doesn't work with `group_rows`. 
+```{r}
+mtcars[1:10, 1:6] %>%
+  kable("html") %>%
+  kable_styling() %>%
+  add_header_above(c(" ", "Data 1" = 3, "Data 2" = 3)) %>%
+  add_header_left(c("Group A" = 3, "Group B" = 7), "Group") %>%
+  add_header_left(c("Team X" = 4, "Team Y" = 2, "Team Z" = 4), "Team") 
+```
diff --git a/docs/awesome_table_in_html.html b/docs/awesome_table_in_html.html
index 983cb62..72832f9 100644
--- a/docs/awesome_table_in_html.html
+++ b/docs/awesome_table_in_html.html
@@ -11,7 +11,7 @@
 
 <meta name="author" content="Hao Zhu" />
 
-<meta name="date" content="2017-06-14" />
+<meta name="date" content="2017-06-15" />
 
 <title>Create Awesome HTML Table with knitr::kable and kableExtra</title>
 
@@ -217,7 +217,7 @@
 
 <h1 class="title toc-ignore">Create Awesome HTML Table with knitr::kable and kableExtra</h1>
 <h4 class="author"><em>Hao Zhu</em></h4>
-<h4 class="date"><em>2017-06-14</em></h4>
+<h4 class="date"><em>2017-06-15</em></h4>
 
 </div>
 
@@ -3435,6 +3435,309 @@
 </tbody>
 </table>
 </div>
+<div id="add-header-column-to-the-left" class="section level1">
+<h1>Add header column to the left</h1>
+<p>An alternative way of grouping rows is being added to <code>kableExtra</code> 0.3.0. Unlike <code>group_rows</code>, the new function <code>add_header_left</code> adopts a similar syntax with <code>add_header_above</code>. It allows users to add multiple layers of row groups, which is a limitation of <code>group_rows</code>. Currently, <code>add_header_left</code> in HTML is in good shape with exception that it doesn’t work with <code>group_rows</code>.</p>
+<pre class="r"><code>mtcars[1:10, 1:6] %&gt;%
+  kable(&quot;html&quot;) %&gt;%
+  kable_styling() %&gt;%
+  add_header_above(c(&quot; &quot;, &quot;Data 1&quot; = 3, &quot;Data 2&quot; = 3)) %&gt;%
+  add_header_left(c(&quot;Group A&quot; = 3, &quot;Group B&quot; = 7), &quot;Group&quot;) %&gt;%
+  add_header_left(c(&quot;Team X&quot; = 4, &quot;Team Y&quot; = 2, &quot;Team Z&quot; = 4), &quot;Team&quot;) </code></pre>
+<?xml version="1.0" encoding="UTF-8" ?>
+<table class="table" style="margin-left: auto; margin-right: auto;">
+<thead>
+<tr>
+<th style="text-align:center; vertical-align: bottom;" rowspan="2">
+Team
+</th>
+<th style="text-align:center; vertical-align: bottom;" rowspan="2">
+Group
+</th>
+<th style="border-bottom:hidden"></th>
+<th style="text-align:center; border-bottom:hidden; padding-bottom:0; padding-left:3px;padding-right:3px;" colspan="3">
+<div style="border-bottom: 1px solid #ddd;padding-bottom: 5px;">
+Data 1
+</div>
+</th>
+<th style="text-align:center; border-bottom:hidden; padding-bottom:0; padding-left:3px;padding-right:3px;" colspan="3">
+<div style="border-bottom: 1px solid #ddd;padding-bottom: 5px;">
+Data 2
+</div>
+</th>
+</tr>
+<tr>
+<th style="text-align:left;">
+</th>
+<th style="text-align:right;">
+mpg
+</th>
+<th style="text-align:right;">
+cyl
+</th>
+<th style="text-align:right;">
+disp
+</th>
+<th style="text-align:right;">
+hp
+</th>
+<th style="text-align:right;">
+drat
+</th>
+<th style="text-align:right;">
+wt
+</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td style="text-align:center; vertical-align: middle;" rowspan="4">
+Team X
+</td>
+<td style="text-align:center; vertical-align: middle;" rowspan="3">
+Group A
+</td>
+<td style="text-align:left;">
+Mazda RX4
+</td>
+<td style="text-align:right;">
+21.0
+</td>
+<td style="text-align:right;">
+6
+</td>
+<td style="text-align:right;">
+160.0
+</td>
+<td style="text-align:right;">
+110
+</td>
+<td style="text-align:right;">
+3.90
+</td>
+<td style="text-align:right;">
+2.620
+</td>
+</tr>
+<tr>
+<td style="text-align:left;">
+Mazda RX4 Wag
+</td>
+<td style="text-align:right;">
+21.0
+</td>
+<td style="text-align:right;">
+6
+</td>
+<td style="text-align:right;">
+160.0
+</td>
+<td style="text-align:right;">
+110
+</td>
+<td style="text-align:right;">
+3.90
+</td>
+<td style="text-align:right;">
+2.875
+</td>
+</tr>
+<tr>
+<td style="text-align:left;">
+Datsun 710
+</td>
+<td style="text-align:right;">
+22.8
+</td>
+<td style="text-align:right;">
+4
+</td>
+<td style="text-align:right;">
+108.0
+</td>
+<td style="text-align:right;">
+93
+</td>
+<td style="text-align:right;">
+3.85
+</td>
+<td style="text-align:right;">
+2.320
+</td>
+</tr>
+<tr>
+<td style="text-align:center; vertical-align: middle;" rowspan="7">
+Group B
+</td>
+<td style="text-align:left;">
+Hornet 4 Drive
+</td>
+<td style="text-align:right;">
+21.4
+</td>
+<td style="text-align:right;">
+6
+</td>
+<td style="text-align:right;">
+258.0
+</td>
+<td style="text-align:right;">
+110
+</td>
+<td style="text-align:right;">
+3.08
+</td>
+<td style="text-align:right;">
+3.215
+</td>
+</tr>
+<tr>
+<td style="text-align:center; vertical-align: middle;" rowspan="2">
+Team Y
+</td>
+<td style="text-align:left;">
+Hornet Sportabout
+</td>
+<td style="text-align:right;">
+18.7
+</td>
+<td style="text-align:right;">
+8
+</td>
+<td style="text-align:right;">
+360.0
+</td>
+<td style="text-align:right;">
+175
+</td>
+<td style="text-align:right;">
+3.15
+</td>
+<td style="text-align:right;">
+3.440
+</td>
+</tr>
+<tr>
+<td style="text-align:left;">
+Valiant
+</td>
+<td style="text-align:right;">
+18.1
+</td>
+<td style="text-align:right;">
+6
+</td>
+<td style="text-align:right;">
+225.0
+</td>
+<td style="text-align:right;">
+105
+</td>
+<td style="text-align:right;">
+2.76
+</td>
+<td style="text-align:right;">
+3.460
+</td>
+</tr>
+<tr>
+<td style="text-align:center; vertical-align: middle;" rowspan="4">
+Team Z
+</td>
+<td style="text-align:left;">
+Duster 360
+</td>
+<td style="text-align:right;">
+14.3
+</td>
+<td style="text-align:right;">
+8
+</td>
+<td style="text-align:right;">
+360.0
+</td>
+<td style="text-align:right;">
+245
+</td>
+<td style="text-align:right;">
+3.21
+</td>
+<td style="text-align:right;">
+3.570
+</td>
+</tr>
+<tr>
+<td style="text-align:left;">
+Merc 240D
+</td>
+<td style="text-align:right;">
+24.4
+</td>
+<td style="text-align:right;">
+4
+</td>
+<td style="text-align:right;">
+146.7
+</td>
+<td style="text-align:right;">
+62
+</td>
+<td style="text-align:right;">
+3.69
+</td>
+<td style="text-align:right;">
+3.190
+</td>
+</tr>
+<tr>
+<td style="text-align:left;">
+Merc 230
+</td>
+<td style="text-align:right;">
+22.8
+</td>
+<td style="text-align:right;">
+4
+</td>
+<td style="text-align:right;">
+140.8
+</td>
+<td style="text-align:right;">
+95
+</td>
+<td style="text-align:right;">
+3.92
+</td>
+<td style="text-align:right;">
+3.150
+</td>
+</tr>
+<tr>
+<td style="text-align:left;">
+Merc 280
+</td>
+<td style="text-align:right;">
+19.2
+</td>
+<td style="text-align:right;">
+6
+</td>
+<td style="text-align:right;">
+167.6
+</td>
+<td style="text-align:right;">
+123
+</td>
+<td style="text-align:right;">
+3.92
+</td>
+<td style="text-align:right;">
+3.440
+</td>
+</tr>
+</tbody>
+</table>
+</div>
 
 
 
diff --git a/docs/awesome_table_in_pdf.Rmd b/docs/awesome_table_in_pdf.Rmd
index aaded10..c20f16f 100644
--- a/docs/awesome_table_in_pdf.Rmd
+++ b/docs/awesome_table_in_pdf.Rmd
@@ -251,3 +251,14 @@
   column_spec(7, bold = T) %>%
   row_spec(5, bold = T)
 ```
+
+# Add header column to the left
+An alternative way of grouping rows is being added to `kableExtra` 0.3.0. Unlike `group_rows`, the new function `add_header_left` adopts a similar syntax with `add_header_above`. It allows users to add multiple layers of row groups, which is a limitation of `group_rows`. A limitation of `add_header_left` is that, you can only use it in `booktabs` tables. There is no future plan to extend support to LaTeX table without booktabs because when a new layer of heading columns being added, every `cline` in normal table needs to be changed. Other limitations include incompatible with `group_rows` and a little in-stable `striped` row coloring behavior. If you don't have special need for multiple layers of heading columns or special love to this format, I will recommend you stick with `group_rows`. 
+
+```{r}
+mtcars[1:10, 1:6] %>%
+  kable("latex", booktabs= T) %>%
+  add_header_above(c(" ", "Data 1" = 3, "Data 2" = 3)) %>%
+  add_header_left(c("Group A" = 3, "Group B" = 7), "Group") %>%
+  add_header_left(c("Team X" = 4, "Team Y" = 2, "Team Z" = 4), "Team") 
+```
diff --git a/docs/awesome_table_in_pdf.pdf b/docs/awesome_table_in_pdf.pdf
index 5d6a188..0f92239 100644
--- a/docs/awesome_table_in_pdf.pdf
+++ b/docs/awesome_table_in_pdf.pdf
Binary files differ