diff --git a/categories/go.md b/categories/go.md
index 80b627b..f488e27 100644
--- a/categories/go.md
+++ b/categories/go.md
@@ -1,5 +1,3 @@
-# Go
-
 ## pass pointer or value
 - value: Variable must not be modified
 - Variable is a large struct  then prefer pointer
@@ -150,9 +148,8 @@ func main() {
 
 
 ### RWMutex
-  > A RWMutex is a reader/writer mutual exclusion lock. The lock can be held by an arbitrary number of readers or a single writer. The zero value for a RWMutex is an unlocked mutex.
-
-In other words, readers don't have to wait for each other. They only have to wait for writers holding the lock.
+!> A RWMutex is a reader/writer mutual exclusion lock. The lock can be held by an arbitrary number of readers or a single writer. The zero value for a RWMutex is an unlocked mutex.
+!> In other words, readers don't have to wait for each other. They only have to wait for writers holding the lock.
 
 ### string literals