diff --git a/README.md b/README.md
index 47d39a8..d212b93 100644
--- a/README.md
+++ b/README.md
@@ -2065,7 +2065,7 @@ with lock:
 ```
 
 ### Semaphore, Event, Barrier
-```
+```python
 <Semaphore> = Semaphore(value=1)     # Lock that can be acquired 'value' times.
 <Event>     = Event()                # Method wait() blocks until set() is called.
 <Barrier>   = Barrier(n_times)       # Method wait() blocks until it's called n_times.
diff --git a/index.html b/index.html
index 5a92f55..b046a2b 100644
--- a/index.html
+++ b/index.html
@@ -1822,7 +1822,7 @@ lock.release()
     ...
 </code></pre></div>
 
-<div><h3 id="semaphoreeventbarrier">Semaphore, Event, Barrier</h3><pre><code class="python hljs">&lt;Semaphore&gt; = Semaphore(value=<span class="hljs-number">1</span>)     <span class="hljs-comment"># Lock that can be acquired 'value' times.</span>
+<div><h3 id="semaphoreeventbarrier">Semaphore, Event, Barrier</h3><pre><code class="python language-python hljs">&lt;Semaphore&gt; = Semaphore(value=<span class="hljs-number">1</span>)     <span class="hljs-comment"># Lock that can be acquired 'value' times.</span>
 &lt;Event&gt;     = Event()                <span class="hljs-comment"># Method wait() blocks until set() is called.</span>
 &lt;Barrier&gt;   = Barrier(n_times)       <span class="hljs-comment"># Method wait() blocks until it's called n_times.</span>
 </code></pre></div>