diff --git a/README.md b/README.md
index 0c8b891..5c18a81 100644
--- a/README.md
+++ b/README.md
@@ -390,7 +390,7 @@ import re
 
 Format
 ------
-```bash
+```perl
 <str> = f'{<el_1>}, {<el_2>}'            # Curly brackets can also contain expressions.
 <str> = '{}, {}'.format(<el_1>, <el_2>)  # Or: '{0}, {a}'.format(<el_1>, a=<el_2>)
 <str> = '%s, %s' % (<el_1>, <el_2>)      # Redundant and inferior C-style formatting.
diff --git a/index.html b/index.html
index 48d30c7..37e9dc9 100644
--- a/index.html
+++ b/index.html
@@ -364,7 +364,7 @@ Point(x=<span class="hljs-number">1</span>, y=<span class="hljs-number">2</span>
 <li><strong>As shown above, it restricts all special sequence matches to the first 128 characters and prevents <code class="python hljs"><span class="hljs-string">'\s'</span></code> from accepting <code class="python hljs"><span class="hljs-string">'[\x1c-\x1f]'</span></code> (the so-called separator characters).</strong></li>
 <li><strong>Use a capital letter for negation (all non-ASCII characters will be matched when used in combination with ASCII flag).</strong></li>
 </ul>
-<div><h2 id="format"><a href="#format" name="format">#</a>Format</h2><pre><code class="bash language-bash hljs">&lt;str&gt; = f<span class="hljs-string">'{&lt;el_1&gt;}, {&lt;el_2&gt;}'</span>            <span class="hljs-comment"># Curly brackets can also contain expressions.</span>
+<div><h2 id="format"><a href="#format" name="format">#</a>Format</h2><pre><code class="python hljs">&lt;str&gt; = <span class="hljs-string">f'<span class="hljs-subst">{&lt;el_1&gt;}</span>, <span class="hljs-subst">{&lt;el_2&gt;}</span>'</span>            <span class="hljs-comment"># Curly brackets can also contain expressions.</span>
 &lt;str&gt; = <span class="hljs-string">'{}, {}'</span>.format(&lt;el_1&gt;, &lt;el_2&gt;)  <span class="hljs-comment"># Or: '{0}, {a}'.format(&lt;el_1&gt;, a=&lt;el_2&gt;)</span>
 &lt;str&gt; = <span class="hljs-string">'%s, %s'</span> % (&lt;el_1&gt;, &lt;el_2&gt;)      <span class="hljs-comment"># Redundant and inferior C-style formatting.</span>
 </code></pre></div>
diff --git a/parse.js b/parse.js
index 080d8d4..9d8cef3 100755
--- a/parse.js
+++ b/parse.js
@@ -713,6 +713,7 @@ 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');
   $('code').each(function(index) {
       hljs.highlightBlock(this);
   });