diff --git a/mlir/include/mlir/Dialect/StandardOps/IR/Ops.td b/mlir/include/mlir/Dialect/StandardOps/IR/Ops.td
--- a/mlir/include/mlir/Dialect/StandardOps/IR/Ops.td
+++ b/mlir/include/mlir/Dialect/StandardOps/IR/Ops.td
@@ -1979,7 +1979,7 @@
     Example:
 
     ```mlir
-    %1 = rank %0 : index
+    %1 = rank %0 : tensor<*xf32>
     ```
   }];