diff --git a/extentions/js/c3ext.js b/extensions/js/c3ext.js
similarity index 100%
rename from extentions/js/c3ext.js
rename to extensions/js/c3ext.js
diff --git a/extentions/js/utils.js b/extensions/js/utils.js
similarity index 100%
rename from extentions/js/utils.js
rename to extensions/js/utils.js
diff --git a/htdocs/js/extensions b/htdocs/js/extensions
new file mode 120000
index 0000000..4761652
--- /dev/null
+++ b/htdocs/js/extensions
@@ -0,0 +1 @@
+../../extensions/js
\ No newline at end of file
diff --git a/htdocs/js/extentions b/htdocs/js/extentions
deleted file mode 120000
index 32410e5..0000000
--- a/htdocs/js/extentions
+++ /dev/null
@@ -1 +0,0 @@
-../../extentions/js
\ No newline at end of file
diff --git a/htdocs/samples/zoom_reduction.html b/htdocs/samples/zoom_reduction.html
index d408246..dc9b0bb 100644
--- a/htdocs/samples/zoom_reduction.html
+++ b/htdocs/samples/zoom_reduction.html
@@ -5,12 +5,12 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <link rel="shortcut icon" href="/images/logo_128.ico" />
     <link href="/css/c3.css" rel="stylesheet" />
-    <script src="/js/extentions/utils.js"></script>
+    <script src="/js/extensions/utils.js"></script>
     <script src="http://code.jquery.com/jquery-2.0.3.min.js"></script>
     <script src="https://rawgithub.com/brandonaaron/jquery-mousewheel/master/jquery.mousewheel.min.js"></script>
     <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
-    <script src="/js/extentions/c3ext.js"></script>
+    <script src="/js/extensions/c3ext.js"></script>
     <script src="/js/samples/zoom2.js"></script>
 </head>
 <body onload="main()">
