diff --git a/eBook/12.6.md b/eBook/12.6.md
index e778705..095ce31 100644
--- a/eBook/12.6.md
+++ b/eBook/12.6.md
@@ -7,7 +7,7 @@ func cat(f *os.File) {
 	const NBUF = 512
 	var buf [NBUF]byte
 	for {
-		switch nr, err := f.Read(buf[:]); true {
+		switch nr, err := f.Read(buf[:]);  {
 		case nr < 0:
 			fmt.Fprintf(os.Stderr, "cat: error reading: %s\n", err.Error())
 			os.Exit(1)