JAL-1835 updated documentation in preferences

diff --git a/help/html/features/preferences.html b/help/html/features/preferences.html
index c86abfa..c42bace 100755 (executable)
--- a/help/html/features/preferences.html
+++ b/help/html/features/preferences.html
@@ -179,6 +179,11 @@ sequence positions appended to each sequence id: <pre>
 </pre>
 <p>If the boxes are left unchecked for a particular format, the
 sequence limits will not be appended to the sequence id.</p>
+<p><em>Embed BioJSON to HTML export</em></p>
+<p>When this option is enabled, Jalview embeds <a href="bioJsonFormat.html">BioJSON</a> data within 
+HTML files exported from Jalview at generation time. This enables the exported HTML files
+to be extracted and imported back into the Jalview desktop application at a later time.
+
 <p><em>Use Modeller Output</em></p>
 <p>This option only applies to PIR format output. Jalview
 automatically reads PIR files with sequence descriptions compatible with