diff --git a/pkg.go b/pkg.go
index a177709..a74ab66 100644
--- a/pkg.go
+++ b/pkg.go
@@ -10,8 +10,9 @@ import (
 
 type Error struct {
 	err error
-	file string
-	line int
+	File string
+	Line int
+	Data interface{}
 }
 
 type LogCallback func(Error)
@@ -44,20 +45,21 @@ func callback(wrapped Error) {
 func (wrapped Error) Error() string {
 	return fmt.Sprintf(
 		"[%s:%d] %s",
-		wrapped.file,
-		wrapped.line,
+		wrapped.File,
+		wrapped.Line,
 		wrapped.err.Error(),
 	)
 }
 
-func create(err error) error {
+func create(err error, data interface{}) error {
 	_, file, line, _ := runtime.Caller(2)
 	file = file[baseDirLength+1:]
 
 	wrapped := Error{
 		err: err,
-		file: file,
-		line: line,
+		File: file,
+		Line: line,
+		Data: data,
 	}
 
 	callback(wrapped)
@@ -67,11 +69,20 @@ func create(err error) error {
 
 // Wrap wraps an existing error with file and line.
 func Wrap(err error) error {
-	return create(err)
+	return create(err, "")
+}
+
+func WrapData(err error, data interface{}) error {
+	return create(err, data)
 }
 
 // New creates a new wrapped error with file and line.
 func New(msg string) error {
-	wrapped := create(errors.New(msg))
+	wrapped := create(errors.New(msg), "")
+	return wrapped
+}
+
+func NewData(msg string, data interface{}) error {
+	wrapped := create(errors.New(msg), data)
 	return wrapped
 }