diff --git a/README.md b/README.md
index e1cd5d6..ef227d3 100644
--- a/README.md
+++ b/README.md
@@ -1046,6 +1046,13 @@ class MyCollection:
             yield el
 ```
 
+```python
+>>> from collections.abc import Sequence, Collection, Iterable
+>>> a = MyCollection([1, 2, 3])
+>>> isinstance(a, Sequence), isinstance(a, Collection), isinstance(a, Iterable)
+(False, True, True)
+```
+
 ### Iterator
 ```python
 class Counter:
diff --git a/index.html b/index.html
index bc6664b..5ba62ac 100644
--- a/index.html
+++ b/index.html
@@ -981,6 +981,11 @@ creature  = Creature(Point(<span class="hljs-number">0</span>, <span class="hljs
         <span class="hljs-keyword">for</span> el <span class="hljs-keyword">in</span> self.a:
             <span class="hljs-keyword">yield</span> el
 </code></pre>
+<pre><code class="python language-python hljs"><span class="hljs-meta">&gt;&gt;&gt; </span><span class="hljs-keyword">from</span> collections.abc <span class="hljs-keyword">import</span> Sequence, Collection, Iterable
+<span class="hljs-meta">&gt;&gt;&gt; </span>a = MyCollection([<span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>])
+<span class="hljs-meta">&gt;&gt;&gt; </span>isinstance(a, Sequence), isinstance(a, Collection), isinstance(a, Iterable)
+(<span class="hljs-keyword">False</span>, <span class="hljs-keyword">True</span>, <span class="hljs-keyword">True</span>)
+</code></pre>
 <h3 id="iterator-1">Iterator</h3>
 <pre><code class="python language-python hljs"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Counter</span>:</span>
     <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__init__</span><span class="hljs-params">(self)</span>:</span>