diff --git a/htdocs/Tibetan51Errata.html b/htdocs/Tibetan51Errata.html
index 6cedc57..970fa11 100644
--- a/htdocs/Tibetan51Errata.html
+++ b/htdocs/Tibetan51Errata.html
@@ -266,6 +266,13 @@ The first section of text is the short "introduction" about the Theme and the va
     have made certain guesses as to the correct values, but no
     definitive correction is yet available.
   </li>
+
+  <li>
+    The 'greng-bu vowel glyphs listed for TibetanMachineWeb2.112
+    through TibetanMachineWeb2.126, inclusive, and
+    TibetanMachineWeb3.33 through TibetanMachineWeb3.44, inclusive,
+    are incorrect.  These should be [0, 124], not [0, 125].
+  </li>
 </ul>
 
 <p>