diff --git a/LockOSThread.md b/LockOSThread.md
index e120c00..1c9971d 100644
--- a/LockOSThread.md
+++ b/LockOSThread.md
@@ -9,7 +9,7 @@
 
 Russ Cox presented a good solution for this problem in this [thread](https://groups.google.com/d/msg/golang-nuts/IiWZ2hUuLDA/SNKYYZBelsYJ).
 
-```
+```Go
 package sdl
 
 // Arrange that main.main runs on main thread.
@@ -42,7 +42,8 @@
 ```
 
 And then other functions you write in package sdl can be like
-```
+
+```Go
 func Beep() {
 	do(func() {
 		// whatever must run in main thread