Fix formatting after import
diff --git a/LockOSThread.md b/LockOSThread.md
index bb25131..e120c00 100644
--- a/LockOSThread.md
+++ b/LockOSThread.md
@@ -14,7 +14,7 @@
 
 // Arrange that main.main runs on main thread.
 func init() {
-    runtime.LockOSThread()
+	runtime.LockOSThread()
 }
 
 // Main runs the main SDL service loop.
@@ -22,9 +22,9 @@
 // Main does not return. If the binary needs to do other work, it
 // must do it in separate goroutines.
 func Main() {
-    for f = range mainfunc {
-        f()
-    }
+	for f = range mainfunc {
+		f()
+	}
 }
 
 // queue of work to run in main thread.
@@ -32,20 +32,20 @@
 
 // do runs f on the main thread.
 func do(f func()) {
-    done := make(chan bool, 1)
-    mainfunc <- func() {
-        f()
-        done <- true
-    }
-    <-done
+	done := make(chan bool, 1)
+	mainfunc <- func() {
+		f()
+		done <- true
+	}
+	<-done
 }
 ```
 
 And then other functions you write in package sdl can be like
 ```
 func Beep() {
-    do(func() {
-        // whatever must run in main thread
-    })
+	do(func() {
+		// whatever must run in main thread
+	})
 }
 ```
\ No newline at end of file