diff --git a/oscar/build_number.h b/oscar/build_number.h
index ee0f0939..396b197e 100644
--- a/oscar/build_number.h
+++ b/oscar/build_number.h
@@ -1 +1 @@
-const int build_number = 3;
+const int build_number = 4;
diff --git a/oscar/docs/release_notes.html b/oscar/docs/release_notes.html
index 6daf49c1..b9e6cbc4 100644
--- a/oscar/docs/release_notes.html
+++ b/oscar/docs/release_notes.html
@@ -7,7 +7,16 @@ Which was written and copyright 2011-2018 © Mark Watkins
 </p>
 
 <p>
-<b>Changes and fixes in OSCAR v1.0.0-beta-1</b>
+<b>Changes and fixes in OSCAR v1.0.0-beta-4</b>
+<list>
+<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>
+<li>Various fixes to tab and button visibility depending on profile and machine data presence.</li>
+</list>
+</p>
+<p>
+<b>Changes and fixes in OSCAR v1.0.0-beta-3</b>
 <list>
 <li>Portions of OSCAR are &copy; 2019 by Nightowl Software</li>
 <li>and members of the apnea community</li>