diff --git a/README.md b/README.md
index c5ab9cb..b87ccb7 100644
--- a/README.md
+++ b/README.md
@@ -2060,7 +2060,7 @@ from threading import Thread, RLock, Semaphore, Event, Barrier
 
 ### Lock
 ```python
-<lock> = RLock()
+<lock> = RLock()                      # Lock that can only be released by the owner.
 <lock>.acquire()                      # Waits for lock to be available.
 <lock>.release()                      # Makes the lock available again.
 ```
diff --git a/index.html b/index.html
index 3686d2f..1d03b85 100644
--- a/index.html
+++ b/index.html
@@ -1832,7 +1832,7 @@ CompletedProcess(args=[<span class="hljs-string">'bc'</span>, <span class="hljs-
 <li><strong>Use <code class="python hljs"><span class="hljs-string">'kwargs=&lt;dict&gt;'</span></code> to pass keyword arguments to the function.</strong></li>
 <li><strong>Use <code class="python hljs"><span class="hljs-string">'daemon=True'</span></code>, or the program will not be able to exit while the thread is alive.</strong></li>
 </ul>
-<div><h3 id="lock">Lock</h3><pre><code class="python language-python hljs">&lt;lock&gt; = RLock()
+<div><h3 id="lock">Lock</h3><pre><code class="python language-python hljs">&lt;lock&gt; = RLock()                      <span class="hljs-comment"># Lock that can only be released by the owner.</span>
 &lt;lock&gt;.acquire()                      <span class="hljs-comment"># Waits for lock to be available.</span>
 &lt;lock&gt;.release()                      <span class="hljs-comment"># Makes the lock available again.</span>
 </code></pre></div>