diff --git a/README.md b/README.md
index 01a1006..7a3c684 100644
--- a/README.md
+++ b/README.md
@@ -86,9 +86,9 @@ value  = <dict>.setdefault(key, default=None)   # Returns and writes default if
 ```
 
 ```python
-value = <dict>.pop(key)                         # Removes item or raises KeyError.
 <dict>.update(<dict>)                           # Adds items. Replaces ones with matching keys.
-[k for k, v in <dict>.items() if v == value]    # Returns list of keys that point to the value.
+value = <dict>.pop(key)                         # Removes item or raises KeyError.
+{k for k, v in <dict>.items() if v == value}    # Returns set of keys that point to the value.
 {k: v for k, v in <dict>.items() if k in keys}  # Returns dictionary filtered by keys.
 ```
 
diff --git a/index.html b/index.html
index 6e21009..581941c 100644
--- a/index.html
+++ b/index.html
@@ -270,9 +270,9 @@ value  = &lt;dict&gt;.setdefault(key, default=<span class="hljs-keyword">None</s
 &lt;dict&gt; = dict(zip(keys, values))                <span class="hljs-comment"># Creates a dict from two collections.</span>
 &lt;dict&gt; = dict.fromkeys(keys [, value])          <span class="hljs-comment"># Creates a dict from collection of keys.</span>
 </code></pre>
-<pre><code class="python language-python hljs">value = &lt;dict&gt;.pop(key)                         <span class="hljs-comment"># Removes item or raises KeyError.</span>
-&lt;dict&gt;.update(&lt;dict&gt;)                           <span class="hljs-comment"># Adds items. Replaces ones with matching keys.</span>
-[k <span class="hljs-keyword">for</span> k, v <span class="hljs-keyword">in</span> &lt;dict&gt;.items() <span class="hljs-keyword">if</span> v == value]    <span class="hljs-comment"># Returns list of keys that point to the value.</span>
+<pre><code class="python language-python hljs">&lt;dict&gt;.update(&lt;dict&gt;)                           <span class="hljs-comment"># Adds items. Replaces ones with matching keys.</span>
+value = &lt;dict&gt;.pop(key)                         <span class="hljs-comment"># Removes item or raises KeyError.</span>
+{k <span class="hljs-keyword">for</span> k, v <span class="hljs-keyword">in</span> &lt;dict&gt;.items() <span class="hljs-keyword">if</span> v == value}    <span class="hljs-comment"># Returns set of keys that point to the value.</span>
 {k: v <span class="hljs-keyword">for</span> k, v <span class="hljs-keyword">in</span> &lt;dict&gt;.items() <span class="hljs-keyword">if</span> k <span class="hljs-keyword">in</span> keys}  <span class="hljs-comment"># Returns dictionary filtered by keys.</span>
 </code></pre>
 <div><h3 id="counter">Counter</h3><pre><code class="python language-python hljs"><span class="hljs-meta">&gt;&gt;&gt; </span><span class="hljs-keyword">from</span> collections <span class="hljs-keyword">import</span> Counter