diff --git a/oscar/docs/release_notes.html b/oscar/docs/release_notes.html
index 38d4e2c3..80c133b8 100644
--- a/oscar/docs/release_notes.html
+++ b/oscar/docs/release_notes.html
@@ -12,7 +12,7 @@ Which was written and copyright 2011-2018 © Mark Watkins
 <li>Portions of OSCAR are &copy; 2019 by The OSCAR Team</li>
 <li>Added code to migrate an old data directory to a new data directory</li>
 <li>Removed "-d" startup option and "Change directory" file menu item. Use the
-"-datadir foldername" startup option to create or change the data directory.</li>
+"--datadir foldername" startup option to create or change the data directory.</li>
 <li>Various fixes to tab and button visibility depending on profile and machine data presence.</li>
 </list>
 </p>