diff --git a/src/query/sql/src/planner/optimizer/optimizer.rs b/src/query/sql/src/planner/optimizer/optimizer.rs
index 0bf259b654b4..b0974cdbd41d 100644
--- a/src/query/sql/src/planner/optimizer/optimizer.rs
+++ b/src/query/sql/src/planner/optimizer/optimizer.rs
@@ -183,7 +183,7 @@ pub fn optimize_query(
     heuristic.optimize_expression(&result, &RESIDUAL_RULES)
 }
 
-// TODO(leiysky): reuse the optimization logic with `optimize_query`
+// TODO(leiysky): reuse the optimization logic with `optimize_query`.
 fn get_optimized_memo(
     ctx: Arc<dyn TableContext>,
     s_expr: SExpr,