diff --git a/wgsl/index.bs b/wgsl/index.bs
index e04671eb5f..ecc606c8e0 100644
--- a/wgsl/index.bs
+++ b/wgsl/index.bs
@@ -489,8 +489,11 @@ The following is a list of keywords which are reserved for future expansion.
   <tr><td>`NOT_EQUAL`<td>!==
   <tr><td>`GREATER_THAN`<td>>
   <tr><td>`GREATER_THAN_EQUAL`<td>>=
+  <tr><td>`LOGICAL_SHIFT_RIGHT`<td>>>
+  <tr><td>`ARITH_SHIFT_RIGHT`<td>>>>
   <tr><td>`LESS_THAN`<td><
   <tr><td>`LESS_THAN_EQUAL`<td><=
+  <tr><td>`SHIFT_LEFT`<td><<
   <tr><td>`MOD`<td>%
   <tr><td>`MINUS`<td>-
   <tr><td>`NAMESPACE`<td>::
@@ -1340,11 +1343,11 @@ additive_expression
 
 shift_expression
   : additive_expression
-  | shift_expression LESS_THAN LESS_THAN additive_expression
+  | shift_expression SHIFT_LEFT additive_expression
         OpShiftLeftLogical
-  | shift_expression GREATER_THAN GREATER_THAN additive_expression
+  | shift_expression LOGICAL_SHIFT_RIGHT additive_expression
         OpShiftRightLogical
-  | shift_expression GREATER_THAN GREATER_THAN GREATER_THAN additive_expression
+  | shift_expression ARITH_SHIFT_RIGHT additive_expression
         OpShiftRightArithmetic
 
 relational_expression