diff --git a/lib/bcoin/writer.js b/lib/bcoin/writer.js
index 7437cd18..b880357a 100644
--- a/lib/bcoin/writer.js
+++ b/lib/bcoin/writer.js
@@ -72,6 +72,11 @@ BufferWriter.prototype.render = function render(keep) {
       case 'checksum':
         off += utils.checksum(data.slice(0, off)).copy(data, off);
         break;
+      // case 'seek': off += item[1]; break;
+      // case 'fill':
+      //   item[1].fill(item[1], off, off + item[2]);
+      //   off += item[2];
+      //   break;
     }
   }
 
@@ -354,6 +359,21 @@ BufferWriter.prototype.fill = function fill(value, size) {
   this.data.push(['bytes', buf]);
 };
 
+// BufferWriter.prototype.fill = function fill(value, size) {
+//   assert(size >= 0);
+//   this.written += size;
+//   this.data.push(['fill', value, size]);
+// };
+
+/*
+ * Seek to relative offset.
+ * @param {Number} offset
+ */
+
+// BufferWriter.prototype.seek = function seek(offset) {
+//   this.data.push(['seek', offset]);
+// };
+
 /**
  * Write float le.
  * @param {Number} value