custom data can now be added to the block chain using OP_RETURN when building a transaction

index.html

@@ -283,7 +283,7 @@
 
 					<div class="tab-pane tab-content" id="newTransaction">
 						<h2>Transaction <small>Create a new transaction</small></h2>
-						<p>Use this page to create to create a raw transaction</p>
+						<p>Use this page to create a raw transaction</p>
 
 						<b>Address, WIF key or Multisig Redeem Script</b>:
 						<div class="input-group">
@@ -311,6 +311,14 @@
 
 								<hr>
 
+								<label>Null Data</label> <span class="text-muted text-normal">(40 byte limit)</span>
+								<p class="checkbox">
+									<label><input type="checkbox" id="opReturn" class="checkbox-inline"> Allow data to be sent within the transaction and stored in the blockchain by using <a href="https://bitcoin.org/en/developer-guide#null-data" target="_"blank">OP_RETURN</a>.</label>
+									<div class="text-muted">When using this option you may enter a hex string or address into the address field on the output tab.</div>
+								</p>
+
+								<hr>
+
 								<label>Lock Time</label>
 								<p>The <a href="https://bitcoin.org/en/developer-guide#locktime-and-sequence-number">locktime</a> indicates the earliest time a transaction can be added to the block chain.</p>
 								<input type="text" class="form-control" value="0" id="nLockTime">