diff --git a/build/docs/content/04-html.md b/build/docs/content/04-html.md
index 7ff5532f..85c426d5 100644
--- a/build/docs/content/04-html.md
+++ b/build/docs/content/04-html.md
@@ -343,8 +343,8 @@ use TheCodingMachine\Gotenberg\Request;
 $client = new Client('http://localhost:3000', new \Http\Adapter\Guzzle6\Client());
 $index = DocumentFactory::makeFromPath('index.html', '/path/to/file');
 $request = new HTMLRequest($index);
-$request->setPageRanges("1-3,5");
-$dest = "result.pdf";
+$request->setPageRanges('1-3,5');
+$dest = 'result.pdf';
 $client->store($request, $dest);
 ```
 
diff --git a/build/docs/content/07-office.md b/build/docs/content/07-office.md
index a6ec46e0..a024b236 100644
--- a/build/docs/content/07-office.md
+++ b/build/docs/content/07-office.md
@@ -161,7 +161,7 @@ $files = [
     DocumentFactory::makeFromPath('document.docx', '/path/to/file'),
 ];
 $request = new OfficeRequest($files);
-$request->setPageRanges("1-3");
-$dest = "result.pdf";
+$request->setPageRanges('1-3');
+$dest = 'result.pdf';
 $client->store($request, $dest);
 ```
diff --git a/docs/index.html b/docs/index.html
index d2ec8df3..6769a751 100755
--- a/docs/index.html
+++ b/docs/index.html
@@ -787,8 +787,8 @@ use TheCodingMachine\Gotenberg\Request;
 $client = new Client('http://localhost:3000', new \Http\Adapter\Guzzle6\Client());
 $index = DocumentFactory::makeFromPath('index.html', '/path/to/file');
 $request = new HTMLRequest($index);
-$request->setPageRanges("1-3,5");
-$dest = "result.pdf";
+$request->setPageRanges('1-3,5');
+$dest = 'result.pdf';
 $client->store($request, $dest);
 </pre>
 
@@ -1288,8 +1288,8 @@ $files = [
     DocumentFactory::makeFromPath(&#39;document.docx&#39;, &#39;/path/to/file&#39;),
 ];
 $request = new OfficeRequest($files);
-$request-&gt;setPageRanges(&#34;1-3&#34;);
-$dest = &#34;result.pdf&#34;;
+$request-&gt;setPageRanges(&#39;1-3&#39;);
+$dest = &#39;result.pdf&#39;;
 $client-&gt;store($request, $dest);
 </pre>