diff --git a/src/scripts/component/ruler/chromosome.ts b/src/scripts/component/ruler/chromosome.ts
index fa0753a8fa8881bcbab3d32add007f446f03f836..0901ae113cd130282d47de4545f5f41605528ccb 100644
--- a/src/scripts/component/ruler/chromosome.ts
+++ b/src/scripts/component/ruler/chromosome.ts
@@ -58,7 +58,10 @@ export default function () {
         .select<SVGTextElement>(".title > text")
         .style("fill", "black")
         .style("font-family", "monospace")
-        .attr("transform", d => "translate(" + (width / 2 + d.title.length * 8 / 2) + ",20)")
+        .attr(
+          "transform",
+          d => "translate(" + (width / 2 + d.title.length * 8 / 2) + ",20)"
+        )
         .text(d => d.title);
 
 
diff --git a/tests/brushable-chromosome.test.ts b/tests/brushable-chromosome.test.ts
index 9558dd2093892092e706e90d1cd9a85280993057..eef0b1c884d225b4926432665210fdb5532c5e97 100644
--- a/tests/brushable-chromosome.test.ts
+++ b/tests/brushable-chromosome.test.ts
@@ -26,7 +26,9 @@ describe("Test Chromosome Ruler", () => {
       .call(brushableChromosomeRulerComponent, 1500, 20);
     expect(container.html()).toBe(result);
   })
-
+  test("Test end event when selection bigger than max", () => {
+    
+  });
 });