diff --git a/src/main/java/helpers/ScryptHelper.java b/src/main/java/helpers/ScryptHelper.java
index 8fa01d6..5f10d8a 100644
--- a/src/main/java/helpers/ScryptHelper.java
+++ b/src/main/java/helpers/ScryptHelper.java
@@ -17,6 +17,8 @@
  * Generates salted scrypt hashes in a format similar to Modular Crypt Format
  * (MCF).
  *
+ * @license FreeBSD License (BSD-2-Clause) https://opensource.org/licenses/BSD-2-Clause
+ * 
  * @author Mark George <mark.george@otago.ac.nz>
  */
 public final class ScryptHelper {
@@ -164,12 +166,9 @@
 		return Integer.numberOfTrailingZeros(n);
 	}
 
-	/*
-	 * Source: https://stackoverflow.com/a/9670279
-	 */
 	private static byte[] toBytes(CharSequence chars) {
 		CharBuffer charBuffer = CharBuffer.wrap(chars);
-		ByteBuffer byteBuffer = ByteBuffer.allocate(charBuffer.remaining() * 3); // 3 bytes per char UTF-8
+		ByteBuffer byteBuffer = ByteBuffer.allocate(charBuffer.remaining() * 4); // max 4 bytes per char for UTF-8
 
 		CharsetEncoder encoder = utf8.newEncoder();
 		encoder.encode(charBuffer, byteBuffer, true);