diff --git a/js/x11/core/ext/big-requests.js b/js/x11/core/ext/big-requests.js
new file mode 100644
index 0000000..8f91d3d
--- /dev/null
+++ b/js/x11/core/ext/big-requests.js
@@ -0,0 +1,26 @@
+// http://www.x.org/releases/X11R7.6/doc/bigreqsproto/bigreq.html
+
+// TODO: move to templates
+exports.requireExt = function(display, callback)
+{
+    var X = display.client;
+    X.QueryExtension('BIG-REQUESTS', function(err, ext) {
+
+        if (!ext.present)
+            return callback(new Error('extension not available'));
+
+        ext.Enable = function( cb )
+        {
+            X.seq_num++;
+            X.pack_stream.pack('CCS', [ext.majorOpcode, 0, 1]);
+            X.replies[X.seq_num] = [
+                function(buf, opt) {
+                    return buf.unpack('L')[0];
+                },
+                cb
+            ];
+            X.pack_stream.flush();
+        }
+        callback(null, ext);
+    });
+}