diff --git a/js/x11/core/ext/damage.js b/js/x11/core/ext/damage.js
new file mode 100644
index 0000000..467e95c
--- /dev/null
+++ b/js/x11/core/ext/damage.js
@@ -0,0 +1,100 @@
+// http://www.x.org/releases/X11R7.6/doc/damageproto/damageproto.txt
+
+var x11 = Require('x11/core/x11');
+// TODO: move to templates
+
+exports.requireExt = function(display, callback)
+{
+    var X = display.client;
+    X.QueryExtension('DAMAGE', function(err, ext) {
+
+        if (!ext.present)
+            return callback(new Error('extension not available'));
+
+        ext.ReportLevel	= {
+            RawRectangles: 0,
+	    DeltaRectangles: 1,
+            BoundingBox: 2,
+            NonEmpty: 3
+        };
+
+        ext.QueryVersion = function(clientMaj, clientMin, callback)
+        {
+            X.seq_num++;
+            X.pack_stream.pack('CCSLL', [ext.majorOpcode, 0, 3, clientMaj, clientMin]);
+            X.replies[X.seq_num] = [
+                function(buf, opt) {
+                    var res = buf.unpack('LL');
+                    return res;
+                },
+                callback
+            ];
+            X.pack_stream.flush();
+        }
+
+        ext.Create = function( damage, drawable, reportlevel )
+        {
+            X.seq_num++;
+            X.pack_stream.pack('CCSLLCxxx', [ext.majorOpcode, 1, 4, damage, drawable, reportlevel]);
+            X.pack_stream.flush();
+        }
+
+        ext.Destroy = function( damage )
+        {
+            X.seq_num++;
+            X.pack_stream.pack('CCSLL', [ext.majorOpcode, 2, 3, damage]);
+            X.pack_stream.flush();
+        }
+
+        ext.Subtract = function(damage, repair, parts)
+        {
+            X.seq_num++;
+            X.pack_stream.pack('CCSLLL', [ext.majorOpcode, 3, 4, damage, repair, parts]);
+            X.pack_stream.flush();
+        }
+
+        ext.Add = function(damage, region)
+        {
+            X.seq_num++;
+            X.pack_stream.pack('CCSLL', [ext.majorOpcode, 4, 3, damage, region]);
+            X.pack_stream.flush();
+        }
+
+        ext.QueryVersion(1, 1, function(err, vers) {
+            if (err)
+                return callback(err);
+            ext.major = vers[0];
+            ext.minor = vers[1];
+            callback(null, ext);
+        });
+
+        ext.events = {
+            DamageNotify: 0
+        }
+
+        X.eventParsers[ext.firstEvent + ext.events.DamageNotify] = function(type, seq, extra, code, raw)
+        {
+            var event = {};
+            event.level = code;
+            event.seq = seq;
+            event.drawable = extra;
+            var values = raw.unpack('LLssSSssSS');
+            event.damage = values[0];
+            event.time = values[1];
+            event.area = {
+              x: values[2],
+              y: values[3],
+              w: values[4],
+              h: values[5]
+            };
+            event.geometry = {
+              x: values[6],
+              y: values[7],
+              w: values[8],
+              h: values[9]
+            };
+            event.name = 'DamageNotify';
+            return event;
+        };
+    });
+}