diff --git a/creational/singleton.md b/creational/singleton.md
index fa6c463..632cdf8 100644
--- a/creational/singleton.md
+++ b/creational/singleton.md
@@ -9,9 +9,11 @@ package singleton
 
 type singleton map[string]string
 
-var once sync.Once
+var (
+    once sync.Once
 
-var instance singleton
+    instance singleton
+)
 
 func New() singleton {
 	once.Do(func() {