diff --git a/README.md b/README.md
index c27ca96..4c9d279 100644
--- a/README.md
+++ b/README.md
@@ -1206,7 +1206,8 @@ class MyCollection:
 
 ### Sequence
 * **Only required methods are len() and getitem().**
-* **Iter(), contains() and reversed() automatically work on any object that has getitem() defined.**
+* **Iter() and contains() automatically work on any object that has getitem() defined.**
+* **Reversed() automatically works on any object that has getitem() and len() defined.**
 ```python
 class MySequence:
     def __init__(self, a):
diff --git a/index.html b/index.html
index 3a1e3b3..0bce2f6 100644
--- a/index.html
+++ b/index.html
@@ -1121,7 +1121,8 @@ lock = threading.RLock(); <span class="hljs-keyword">with</span> lock: ...
 <h3 id="sequence">Sequence</h3>
 <ul>
 <li><strong>Only required methods are len() and getitem().</strong></li>
-<li><strong>Iter(), contains() and reversed() automatically work on any object that has getitem() defined.</strong></li>
+<li><strong>Iter() and contains() automatically work on any object that has getitem() defined.</strong></li>
+<li><strong>Reversed() automatically works on any object that has getitem() and len() defined.</strong></li>
 </ul>
 <pre><code class="python language-python hljs"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">MySequence</span>:</span>
     <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__init__</span><span class="hljs-params">(self, a)</span>:</span>