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diff --git a/buildnotes_jdt-core.html b/buildnotes_jdt-core.html
index ba3d228..58a1e2e 100644
--- a/buildnotes_jdt-core.html
+++ b/buildnotes_jdt-core.html
@@ -42,8 +42,9 @@
<h2>
What's new in this drop</h2>
<ul>
-<li>Added flag <code>IJavaElementDelta.F_PRIMARY_WORKING_COPY</code> that signals that a primary compilation unit has become a
- working copy, or that a primary working copy has become a compilation unit.
+<li>Added flag <code>IJavaElementDelta.F_PRIMARY_WORKING_COPY</code> that signals that a compilation unit has become a
+ primary working copy, or that a primary working copy has reverted to a compilation unit (i.e. primary working copies are not notified
+ as being added/removed like other working copies, since the primary unit is only changing mode, also see bug <a href="http://bugs.eclipse.org/bugs/show_bug.cgi?id=40028">40028</a>).
</li>
</ul>
