diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..b2f22bb
Binary files /dev/null and b/.DS_Store differ
diff --git a/cmd/main.go b/cmd/main.go
index cd85b4e..9bdf51c 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -2,6 +2,7 @@ package main
 
 import (
 	"bytes"
+	"fmt"
 	"io"
 	"io/ioutil"
 	"log"
@@ -59,7 +60,7 @@ func dedupe(config *config) error {
 
 	var base pttodo.Root
 	if err := yaml.Unmarshal(baseB, &base); err != nil {
-		return err
+		return fmt.Errorf("failed to parse yaml in %s: %w", config.target, err)
 	}
 
 	do := func(todos []pttodo.Todo) []pttodo.Todo {
@@ -120,10 +121,10 @@ func archive(config *config) error {
 
 	var base, archive pttodo.Root
 	if err := yaml.Unmarshal(baseB, &base); err != nil {
-		return err
+		return fmt.Errorf("failed to parse yaml in %s: %w", config.target, err)
 	}
 	if err := yaml.Unmarshal(archiveB, &archive); err != nil {
-		return err
+		return fmt.Errorf("failed to parse yaml in %s: %w", config.archive, err)
 	}
 
 	archive.Done = append(archive.Done, base.Done...)
@@ -174,10 +175,10 @@ func merge(config *config) error {
 
 	var base, merging pttodo.Root
 	if err := yaml.Unmarshal(baseB, &base); err != nil {
-		return err
+		return fmt.Errorf("failed to parse yaml in %s: %w", config.target, err)
 	}
 	if err := yaml.Unmarshal(mergingB, &merging); err != nil {
-		return err
+		return fmt.Errorf("failed to parse yaml in %s: %w", config.target2, err)
 	}
 
 	slurp := func(dst, src *[]pttodo.Todo) {
@@ -242,10 +243,10 @@ func _merge(filepath string, mergeTargetFilePath string) error {
 
 	var base, merging pttodo.Root
 	if err := yaml.Unmarshal(baseB, &base); err != nil {
-		return err
+		return fmt.Errorf("failed to parse yaml in %s: %w", filepath, err)
 	}
 	if err := yaml.Unmarshal(mergingB, &merging); err != nil {
-		return err
+		return fmt.Errorf("failed to parse yaml in %s: %w", mergeTargetFilePath, err)
 	}
 
 	base.MergeIn(merging)
diff --git a/pttodoer/.DS_Store b/pttodoer/.DS_Store
new file mode 100644
index 0000000..f3e4dde
Binary files /dev/null and b/pttodoer/.DS_Store differ