diff --git a/docs/awesome_table_in_html.Rmd b/docs/awesome_table_in_html.Rmd
index 3af994c..8e9f38f 100644
--- a/docs/awesome_table_in_html.Rmd
+++ b/docs/awesome_table_in_html.Rmd
@@ -173,16 +173,17 @@
 It is very easy to use `cell_spec` with conditional logic. Here is an example.
 ```{r, message=FALSE, warning=FALSE}
 library(dplyr)
+options(knitr.table.format = "html") 
 mtcars[1:10, 1:2] %>%
   mutate(
     car = row.names(.),
-    mpg = cell_spec(mpg, color = ifelse(mpg > 20, "red", "blue")),
-    cyl = cell_spec(cyl, color = "white", align = "c", angle = 45, 
+    mpg = cell_spec(mpg, "html", color = ifelse(mpg > 20, "red", "blue")),
+    cyl = cell_spec(cyl, "html", color = "white", align = "c", angle = 45, 
                     background = factor(cyl, c(4, 6, 8), 
                                         c("#666666", "#999999", "#BBBBBB")))
   ) %>%
   select(car, mpg, cyl) %>%
-  kable(escape = F) %>%
+  kable(format = "html", escape = F) %>%
   kable_styling("striped", full_width = F)
 ```
 
diff --git a/docs/awesome_table_in_html.html b/docs/awesome_table_in_html.html
index a2b79c7..67ba962 100644
--- a/docs/awesome_table_in_html.html
+++ b/docs/awesome_table_in_html.html
@@ -1962,16 +1962,17 @@
 <h2>Conditional logic</h2>
 <p>It is very easy to use <code>cell_spec</code> with conditional logic. Here is an example.</p>
 <pre class="r"><code>library(dplyr)
+options(knitr.table.format = &quot;html&quot;) 
 mtcars[1:10, 1:2] %&gt;%
   mutate(
     car = row.names(.),
-    mpg = cell_spec(mpg, color = ifelse(mpg &gt; 20, &quot;red&quot;, &quot;blue&quot;)),
-    cyl = cell_spec(cyl, color = &quot;white&quot;, align = &quot;c&quot;, angle = 45, 
+    mpg = cell_spec(mpg, &quot;html&quot;, color = ifelse(mpg &gt; 20, &quot;red&quot;, &quot;blue&quot;)),
+    cyl = cell_spec(cyl, &quot;html&quot;, color = &quot;white&quot;, align = &quot;c&quot;, angle = 45, 
                     background = factor(cyl, c(4, 6, 8), 
                                         c(&quot;#666666&quot;, &quot;#999999&quot;, &quot;#BBBBBB&quot;)))
   ) %&gt;%
   select(car, mpg, cyl) %&gt;%
-  kable(escape = F) %&gt;%
+  kable(format = &quot;html&quot;, escape = F) %&gt;%
   kable_styling(&quot;striped&quot;, full_width = F)</code></pre>
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diff --git a/docs/awesome_table_in_pdf.pdf b/docs/awesome_table_in_pdf.pdf
index 90d7b15..b7ed6e8 100644
--- a/docs/awesome_table_in_pdf.pdf
+++ b/docs/awesome_table_in_pdf.pdf
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