diff --git a/index.bs b/index.bs
index 8230e000..22f53d32 100644
--- a/index.bs
+++ b/index.bs
@@ -1071,7 +1071,7 @@ dictionary MLOperandDescriptor {
 </details>
 
 <p>
-A <dfn>valid dimension</dfn> is an integer greater than zero in the range of {{unsigned long}}. Implementations may impose a smaller upper bound.
+A <dfn>valid dimension</dfn> is an integer greater than zero and in the range of {{long}}. Implementations may impose a smaller upper bound.
 </p>
 
 Issue(391): Should 0-size dimensions be supported?