diff --git a/README.md b/README.md
index 7bf9aef..4692faf 100644
--- a/README.md
+++ b/README.md
@@ -2034,7 +2034,7 @@ Threading
 * **CPython interpreter can only run a single thread at a time.**
 * **That is why using multiple threads won't result in a faster execution, unless at least one of the threads contains an I/O operation.**
 ```python
-from threading import Thread, RLock
+from threading import Thread, RLock, Semaphore, Event, Barrier
 ```
 
 ### Thread
@@ -2063,6 +2063,13 @@ with lock:
     ...
 ```
 
+### Semaphore, Event, Barrier
+```
+<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.
+```
+
 ### Thread Pool Executor
 ```python
 from concurrent.futures import ThreadPoolExecutor
diff --git a/index.html b/index.html
index b3f5b29..136268a 100644
--- a/index.html
+++ b/index.html
@@ -1793,7 +1793,7 @@ db = connector.connect(host=&lt;str&gt;, user=&lt;str&gt;, password=&lt;str&gt;,
 <div><h2 id="threading"><a href="#threading" name="threading">#</a>Threading</h2><ul>
 <li><strong>CPython interpreter can only run a single thread at a time.</strong></li>
 <li><strong>That is why using multiple threads won't result in a faster execution, unless at least one of the threads contains an I/O operation.</strong></li>
-</ul><pre><code class="python language-python hljs"><span class="hljs-keyword">from</span> threading <span class="hljs-keyword">import</span> Thread, RLock
+</ul><pre><code class="python language-python hljs"><span class="hljs-keyword">from</span> threading <span class="hljs-keyword">import</span> Thread, RLock, Semaphore, Event, Barrier
 </code></pre></div>
 
 
@@ -1819,6 +1819,11 @@ 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>
+&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>
+
 <div><h3 id="threadpoolexecutor">Thread Pool Executor</h3><pre><code class="python language-python hljs"><span class="hljs-keyword">from</span> concurrent.futures <span class="hljs-keyword">import</span> ThreadPoolExecutor
 <span class="hljs-keyword">with</span> ThreadPoolExecutor(max_workers=<span class="hljs-keyword">None</span>) <span class="hljs-keyword">as</span> executor:
     &lt;iter&gt;   = executor.map(<span class="hljs-keyword">lambda</span> x: x + <span class="hljs-number">1</span>, range(<span class="hljs-number">3</span>))         <span class="hljs-comment"># (1, 2, 3)</span>