diff --git a/lib/x11/corereqs.js b/lib/x11/corereqs.js
index 4eda415..5309261 100644
--- a/lib/x11/corereqs.js
+++ b/lib/x11/corereqs.js
@@ -341,6 +341,36 @@ module.exports = {
       }
    ],
 
+   ListFonts: [
+      function(pattern, max)
+      {
+          var req_len = 2+xutil.padded_length(pattern.length)/4;
+          return [ 'CxSSSp', [49, req_len, max, pattern.length, pattern] ]; 
+      },
+
+      function(buf) {
+          console.log(buf);
+          // TODO: move to buffer.unpackStringList
+          var res = [];
+          var off = 24;
+          while (off < buf.length)
+          {
+              var len = buf[off++];
+              if (len == 0)
+                  break;
+              if (off + len > buf.length)
+              {
+                  len = buf.length - off;
+                  if (len <= 0)
+                     break;
+              }
+              res.push(buf.unpackString(len, off));
+              off += len;
+          }
+          return res;
+      } 
+   ],
+
    CreatePixmap: [
        function(pid, drawable, depth, width, height) {
           return [ 'CCSLLSS', [53, depth, 4, pid, drawable, width, height] ];
@@ -365,6 +395,23 @@ module.exports = {
         }
    ],
 
+   ChangeGC: [
+       function(cid, values) {
+           var format = 'CxSLL';           
+           var packetLength = 3 + (values ? Object.keys(values).length : 0);
+           var args = [56, packetLength, cid];
+           var vals = packValueMask('CreateGC', values);
+           args.push(vals[0]);     // values bitmask
+           var valArr = vals[1];
+           for (v in valArr)
+           {
+               format += 'L'; // TODO: we know format string length in advance and += inefficient for string
+               args.push(valArr[v]);
+           }           
+           return [format, args];
+        }
+   ],
+
    //
    CopyArea: [
        function(srcDrawable, dstDrawable, gc, srcX, srcY, dstX, dstY, width, height) {