diff --git a/index.js b/index.js
new file mode 100644
index 0000000..4535423
--- /dev/null
+++ b/index.js
@@ -0,0 +1,8 @@
+//wow.
+function fastInvSqrt(x) {
+    var xhalf = 0.5 * x;
+    var i = x;
+    i = i * (1.5 - xhalf * i * i);
+    i = i * (1.5 - xhalf * i * i);
+    return i;
+}