diff --git a/doc/developer/design/20230714_optimizer_interface.md b/doc/developer/design/20230714_optimizer_interface.md
index 10082d418edcd..0c196b19904f3 100644
--- a/doc/developer/design/20230714_optimizer_interface.md
+++ b/doc/developer/design/20230714_optimizer_interface.md
@@ -46,10 +46,10 @@ turn into a use of an `Optimizer`.
 
  - `src/adapter/src/coord/dataflows.rs` and
    `src/adapter/src/coord/sequencer/inner.rs`
- 
+
    The main use of the optimizer, for `CREATE VIEW`, `SELECT`, and
    `EXPLAIN`.
-   
+
  - `src/transform/tests/test_runner.rs`
 
     Some testing of the optimizer.