add note

llvm-svn: 113164
diff --git a/llvm/docs/ReleaseNotes.html b/llvm/docs/ReleaseNotes.html
index 44e983e..7cca0fd 100644
--- a/llvm/docs/ReleaseNotes.html
+++ b/llvm/docs/ReleaseNotes.html
@@ -299,6 +299,7 @@
 <li>RegionInfo pass: opt -regions analyze" or "opt -view-regions". 
 <!-- Tobias Grosser --></li>
 <li>ARMGlobalMerge: <!-- Anton --> </li>
+<li>llvm-diff</li>
 </ul>
 
 </div>