diff --git a/README.md b/README.md
index 5c18a81..b3960ee 100644
--- a/README.md
+++ b/README.md
@@ -2661,21 +2661,21 @@ import numpy as np
 * **Passing a tuple of axes will chain the operations like this: `'<array>.<method>(axis_1).<method>(axis_2 - 1 if axis_2 > axis_1 else axis_2)'`.**
 
 ### Indexing
-```bash
+```perl
 <el>       = <2d_array>[row_index, column_index]        # <3d_a>[table_i, row_i, column_i]
 <1d_view>  = <2d_array>[row_index]                      # <3d_a>[table_i, row_i]
 <1d_view>  = <2d_array>[:, column_index]                # <3d_a>[table_i, :, column_i]
 <2d_view>  = <2d_array>[row_range, column_range]        # <3d_a>[table_i, row_r, column_r]
 ```
 
-```bash
+```perl
 <2d_array> = <2d_array>[row_indexes]                    # <3d_a>[table_i/s, row_is]
 <2d_array> = <2d_array>[:, column_indexes]              # <3d_a>[table_i/s, :, column_is]
 <1d_array> = <2d_array>[row_indexes, column_indexes]    # <3d_a>[table_i/s, row_is, column_is]
 <1d_array> = <2d_array>[row_indexes, column_index]      # <3d_a>[table_i/s, row_is, column_i]
 ```
 
-```bash
+```perl
 <2d_bools> = <2d_array> ><== <el/1d/2d_array>           # 1d_array must have size of a row.
 <1d/2d_a>  = <2d_array>[<2d/1d_bools>]                  # 1d_bools must have size of a column.
 ```
diff --git a/index.html b/index.html
index 37e9dc9..97ea3d8 100644
--- a/index.html
+++ b/index.html
@@ -2178,18 +2178,18 @@ drawer = cg.output.GraphvizOutput(output_file=filename)
 <li><strong>Axis is an index of the dimension that gets aggregated. Leftmost dimension has index 0. Summing the RGB image along axis 2 will return a greyscale image with shape (50, 100).</strong></li>
 <li><strong>Passing a tuple of axes will chain the operations like this: <code class="python hljs"><span class="hljs-string">'&lt;array&gt;.&lt;method&gt;(axis_1).&lt;method&gt;(axis_2 - 1 if axis_2 &gt; axis_1 else axis_2)'</span></code>.</strong></li>
 </ul>
-<div><h3 id="indexing">Indexing</h3><pre><code class="bash language-bash hljs">&lt;el&gt;       = &lt;2d_array&gt;[row_index, column_index]        <span class="hljs-comment"># &lt;3d_a&gt;[table_i, row_i, column_i]</span>
+<div><h3 id="indexing">Indexing</h3><pre><code class="bash hljs">&lt;el&gt;       = &lt;2d_array&gt;[row_index, column_index]        <span class="hljs-comment"># &lt;3d_a&gt;[table_i, row_i, column_i]</span>
 &lt;1d_view&gt;  = &lt;2d_array&gt;[row_index]                      <span class="hljs-comment"># &lt;3d_a&gt;[table_i, row_i]</span>
 &lt;1d_view&gt;  = &lt;2d_array&gt;[:, column_index]                <span class="hljs-comment"># &lt;3d_a&gt;[table_i, :, column_i]</span>
 &lt;2d_view&gt;  = &lt;2d_array&gt;[row_range, column_range]        <span class="hljs-comment"># &lt;3d_a&gt;[table_i, row_r, column_r]</span>
 </code></pre></div>
 
-<pre><code class="bash language-bash hljs">&lt;2d_array&gt; = &lt;2d_array&gt;[row_indexes]                    <span class="hljs-comment"># &lt;3d_a&gt;[table_i/s, row_is]</span>
+<pre><code class="bash hljs">&lt;2d_array&gt; = &lt;2d_array&gt;[row_indexes]                    <span class="hljs-comment"># &lt;3d_a&gt;[table_i/s, row_is]</span>
 &lt;2d_array&gt; = &lt;2d_array&gt;[:, column_indexes]              <span class="hljs-comment"># &lt;3d_a&gt;[table_i/s, :, column_is]</span>
 &lt;1d_array&gt; = &lt;2d_array&gt;[row_indexes, column_indexes]    <span class="hljs-comment"># &lt;3d_a&gt;[table_i/s, row_is, column_is]</span>
 &lt;1d_array&gt; = &lt;2d_array&gt;[row_indexes, column_index]      <span class="hljs-comment"># &lt;3d_a&gt;[table_i/s, row_is, column_i]</span>
 </code></pre>
-<pre><code class="bash language-bash hljs">&lt;2d_bools&gt; = &lt;2d_array&gt; &gt;&lt;== &lt;el/1d/2d_array&gt;           <span class="hljs-comment"># 1d_array must have size of a row.</span>
+<pre><code class="bash hljs">&lt;2d_bools&gt; = &lt;2d_array&gt; &gt;&lt;== &lt;el/1d/2d_array&gt;           <span class="hljs-comment"># 1d_array must have size of a row.</span>
 &lt;1d/2d_a&gt;  = &lt;2d_array&gt;[&lt;2d/1d_bools&gt;]                  <span class="hljs-comment"># 1d_bools must have size of a column.</span>
 </code></pre>
 <ul>
diff --git a/parse.js b/parse.js
index 9d8cef3..76b2581 100755
--- a/parse.js
+++ b/parse.js
@@ -711,9 +711,7 @@ function updateDiagrams() {
 }
 
 function highlightCode() {
-  setApaches(['<D>', '<T>', '<DT>', '<TD>', '<a>', '<n>']);
-  $('code').not('.python').not('.text').not('.bash').not('.apache').addClass('python');
-  $('code.perl').removeClass().addClass('python');
+  changeCodeLanguages();
   $('code').each(function(index) {
       hljs.highlightBlock(this);
   });
@@ -725,6 +723,15 @@ function highlightCode() {
   insertPageBreaks();
 }
 
+function changeCodeLanguages() {
+  setApaches(['<D>', '<T>', '<DT>', '<TD>', '<a>', '<n>']);
+  $('code').not('.python').not('.text').not('.bash').not('.apache').addClass('python');
+  $('code:contains(<el>       = <2d_array>[row_index, column_index])').removeClass().addClass('bash');
+  $('code:contains(<2d_array> = <2d_array>[row_indexes])').removeClass().addClass('bash');
+  $('code:contains(<2d_bools> = <2d_array> ><== <el/1d/2d_array>)').removeClass().addClass('bash');
+  $('code.perl').removeClass().addClass('python');
+}
+
 function setApaches(elements) {
   for (el of elements) {
     $(`code:contains(${el})`).addClass('apache');