diff --git a/src/ledger/file.go b/src/ledger/file.go
index 98642ea..fe48b8d 100644
--- a/src/ledger/file.go
+++ b/src/ledger/file.go
@@ -143,11 +143,13 @@ func (files Files) Add(payee string, delta Delta) error {
 }
 
 func (files Files) append(s string) error {
-	if err := files.trimTrainlingWhitespace(); err != nil {
+	p := path.Join(path.Dir(files.paths()[0]), "inbox.txt")
+
+	if err := files.trimTrailingWhitespace(p); err != nil {
 		return err
 	}
 
-	f, err := os.OpenFile(string(files.paths()[0]), os.O_APPEND|os.O_CREATE|os.O_WRONLY, os.ModePerm)
+	f, err := os.OpenFile(p, os.O_APPEND|os.O_CREATE|os.O_WRONLY, os.ModePerm)
 	if err != nil {
 		return err
 	}
@@ -157,8 +159,8 @@ func (files Files) append(s string) error {
 	return f.Close()
 }
 
-func (files Files) trimTrainlingWhitespace() error {
-	idx, err := files._lastNonWhitespacePos()
+func (files Files) trimTrailingWhitespace(p string) error {
+	idx, err := files._lastNonWhitespacePos(p)
 	if err != nil {
 		return err
 	}
@@ -166,7 +168,7 @@ func (files Files) trimTrainlingWhitespace() error {
 		return nil
 	}
 
-	f, err := os.OpenFile(string(files.paths()[0]), os.O_CREATE|os.O_WRONLY, os.ModePerm)
+	f, err := os.OpenFile(p, os.O_CREATE|os.O_WRONLY, os.ModePerm)
 	if err != nil {
 		return err
 	}
@@ -175,8 +177,8 @@ func (files Files) trimTrainlingWhitespace() error {
 	return f.Truncate(int64(idx + 1))
 }
 
-func (files Files) _lastNonWhitespacePos() (int, error) {
-	f, err := os.Open(string(files.paths()[0]))
+func (files Files) _lastNonWhitespacePos(p string) (int, error) {
+	f, err := os.Open(p)
 	if os.IsNotExist(err) {
 		return -1, nil
 	}
diff --git a/src/ledger/file_test.go b/src/ledger/file_test.go
index ed09328..fd689f5 100644
--- a/src/ledger/file_test.go
+++ b/src/ledger/file_test.go
@@ -70,7 +70,7 @@ func TestFileAdd(t *testing.T) {
 	for name, d := range cases {
 		c := d
 		t.Run(name, func(t *testing.T) {
-			p := path.Join(t.TempDir(), "input")
+			p := path.Join(t.TempDir(), "inbox.txt")
 			if c.given != nil {
 				if err := os.WriteFile(p, []byte(c.given), os.ModePerm); err != nil {
 					t.Fatal(err)
diff --git a/src/ledger/like.go b/src/ledger/like.go
index 4cd710c..e856e38 100644
--- a/src/ledger/like.go
+++ b/src/ledger/like.go
@@ -8,6 +8,12 @@ type Like func(Delta) bool
 
 type Likes []Like
 
+func LikeTransaction(delta Delta) Like {
+	return func(d Delta) bool {
+		return d.transaction == delta.transaction
+	}
+}
+
 func LikeBefore(date string) Like {
 	return func(d Delta) bool {
 		return date >= d.Date