diff --git a/docs/ReleaseNotes.html b/docs/ReleaseNotes.html
index 4c47f9b6a8f..2f83b9447d1 100644
--- a/docs/ReleaseNotes.html
+++ b/docs/ReleaseNotes.html
@@ -1017,6 +1017,11 @@ API changes are:</p>
   were dropped.  GC plugins which compute stack maps must be updated to avoid
   having the old definition overload the new signature.
 </li>
+<li>
+  The signature of <tt>MemoryBuffer::getMemBuffer</tt> changed.  Unfortunately
+  calls intended for the old version still compile, but will not work correctly,
+  leading to a confusing error about an invalid header in the bitcode.
+</li>
   
 <li>
   Some APIs were renamed: