diff --git a/lib/x11/corereqs.js b/lib/x11/corereqs.js
index e94cd9e..5df9543 100644
--- a/lib/x11/corereqs.js
+++ b/lib/x11/corereqs.js
@@ -117,8 +117,16 @@ module.exports = {
        // create request packet - function OR format string
        function(id, parentId, x, y, width, height, borderWidth, depth, _class, visual, values) {
 
-           // TODO: ??? there is depth field in xproto, but xlib just sets it to zero
-           // var depth = 0;
+           if (borderWidth === undefined)
+               borderWidth = 0;
+           if (depth === undefined)
+               depth = 0;
+           if (_class === undefined)
+               _class = 0;
+           if (visual === undefined)
+               visual = 0;
+           if (values === undefined)
+               values = {}
 
            var packetLength = 8 + (values ? Object.keys(values).length : 0);
            // TODO: should be CCSLLssSSSSLL - x,y are signed
@@ -185,6 +193,7 @@ module.exports = {
        ['CxSL', [3, 2]],
        function(buf) 
        {
+           // TODO: change from array to named object fields
            var res = buf.unpack('LSCCLLCCCCCLLLS');
            return res;        
        }