diff --git a/28-error-handling/04b-named-params/main.go b/28-error-handling/04b-named-params/main.go
index 917c562..d1bc9f2 100644
--- a/28-error-handling/04b-named-params/main.go
+++ b/28-error-handling/04b-named-params/main.go
@@ -11,10 +11,10 @@ import (
 	"fmt"
 	"os"
 
-	"github.com/inancgumus/learngo/internal/magic"
+	"github.com/inancgumus/learngo/magic"
 	//
 	// Use the following one for the panicking library:
-	// magic "github.com/inancgumus/learngo/internal/magicpanic"
+	// magic "github.com/inancgumus/learngo/magicpanic"
 	//
 )
 
diff --git a/internal/magic/detect.go b/magic/detect.go
similarity index 96%
rename from internal/magic/detect.go
rename to magic/detect.go
index 59d22db..c13571d 100644
--- a/internal/magic/detect.go
+++ b/magic/detect.go
@@ -9,6 +9,7 @@ package magic
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"io"
 	"os"
@@ -63,7 +64,7 @@ func read(filename string, buf []byte) error {
 	}
 
 	if fi.Size() <= int64(len(buf)) {
-		return fmt.Errorf("file size < len(buf)")
+		return errors.New("file size < len(buf)")
 	}
 
 	_, err = io.ReadFull(file, buf)
diff --git a/internal/magicpanic/detect.go b/magicpanic/detect.go
similarity index 100%
rename from internal/magicpanic/detect.go
rename to magicpanic/detect.go