diff --git a/develop/code_style.html b/develop/code_style.html
index e9cc99d016..675ec76395 100644
--- a/develop/code_style.html
+++ b/develop/code_style.html
@@ -189,7 +189,7 @@ quickly and automatically check for formatting (and sometimes logical)
errors in code.</p>
<p>The necessary tools are detailed below.</p>
<p>First install them with:</p>
-<pre><code>pip install -e ".[lint,mypy]"
+<pre><code class="language-sh">pip install -e ".[lint,mypy]"
</code></pre>
<ul>
<li>
@@ -199,7 +199,7 @@ as an opinionated code formatter, ensuring all comitted code is
properly formatted.</p>
<p>Have <code>black</code> auto-format your code (it shouldn't change any
functionality) with:</p>
-<pre><code>black . --exclude="\.tox|build|env"
+<pre><code class="language-sh">black . --exclude="\.tox|build|env"
</code></pre>
</li>
<li>
@@ -207,7 +207,7 @@ functionality) with:</p>
<p><code>flake8</code> is a code checking tool. We require code to pass <code>flake8</code>
before being merged into the codebase.</p>
<p>Check all application and test code with:</p>
-<pre><code>flake8 synapse tests
+<pre><code class="language-sh">flake8 synapse tests
</code></pre>
</li>
<li>
@@ -215,7 +215,7 @@ before being merged into the codebase.</p>
<p><code>isort</code> ensures imports are nicely formatted, and can suggest and
auto-fix issues such as double-importing.</p>
<p>Auto-fix imports with:</p>
-<pre><code>isort -rc synapse tests
+<pre><code class="language-sh">isort -rc synapse tests
</code></pre>
<p><code>-rc</code> means to recursively search the given directories.</p>
</li>
@@ -247,12 +247,12 @@ in the sphinx documentation.</li>
<p>Prefer to import classes and functions rather than packages or
modules.</p>
<p>Example:</p>
-<pre><code>from synapse.types import UserID
+<pre><code class="language-python">from synapse.types import UserID
...
user_id = UserID(local, server)
</code></pre>
<p>is preferred over:</p>
-<pre><code>from synapse import types
+<pre><code class="language-python">from synapse import types
...
user_id = types.UserID(local, server)
</code></pre>
@@ -333,7 +333,7 @@ will be if no sub-options are enabled).</p>
</li>
</ul>
<p>Example:</p>
-<pre><code>## Frobnication ##
+<pre><code class="language-yaml">## Frobnication ##
# The frobnicator will ensure that all requests are fully frobnicated.
# To enable it, uncomment the following.
|
