diff --git a/docs/ReleaseNotes.html b/docs/ReleaseNotes.html
index 0ef8f3d1f37..9a1b547b4a5 100644
--- a/docs/ReleaseNotes.html
+++ b/docs/ReleaseNotes.html
@@ -468,7 +468,10 @@ Release Notes</a>.</h1>
 
 <p> Loop Vectorizer - We've added a loop vectorizer and we are now able to
     vectorize small loops. The loop vectorizer is disabled by default and
-    can be enabled using the <b>-mllvm -vectorize</b> flag. <br/>
+    can be enabled using the <b>-mllvm -vectorize</b> flag.
+    The SIMD vector width can be specified using the flag
+    <b>-mllvm -force-vector-width=4</b>.
+    <br/>
     We can now vectorize this code:
 
     <pre class="doc_code">