diff --git a/README.md b/README.md
index d53df1c..6869309 100644
--- a/README.md
+++ b/README.md
@@ -195,7 +195,7 @@ from itertools import count, repeat, cycle, chain, islice
 ```
 
 ```python
-<iter> = chain(<coll.>, <coll.>, ...)       # Empties collections in order.
+<iter> = chain(<coll.>, <coll.> [, ...])    # Empties collections in order.
 <iter> = chain.from_iterable(<collection>)  # Empties collections inside a collection in order.
 ```
 
diff --git a/index.html b/index.html
index 5ab0133..0a87f2b 100644
--- a/index.html
+++ b/index.html
@@ -283,7 +283,7 @@ Point(x=<span class="hljs-number">1</span>, y=<span class="hljs-number">2</span>
 &lt;iter&gt; = repeat(&lt;el&gt; [, times])             <span class="hljs-comment"># Returns element endlessly or 'times' times.</span>
 &lt;iter&gt; = cycle(&lt;collection&gt;)                <span class="hljs-comment"># Repeats the sequence indefinitely.</span>
 </code></pre>
-<pre><code class="python language-python hljs">&lt;iter&gt; = chain(&lt;coll.&gt;, &lt;coll.&gt;, ...)       <span class="hljs-comment"># Empties collections in order.</span>
+<pre><code class="python language-python hljs">&lt;iter&gt; = chain(&lt;coll.&gt;, &lt;coll.&gt; [, ...])    <span class="hljs-comment"># Empties collections in order.</span>
 &lt;iter&gt; = chain.from_iterable(&lt;collection&gt;)  <span class="hljs-comment"># Empties collections inside a collection in order.</span>
 </code></pre>
 <pre><code class="python language-python hljs">&lt;iter&gt; = islice(&lt;collection&gt;, to_exclusive)