diff --git a/action_create.go b/action_create.go
index 99fc071..e7854d6 100644
--- a/action_create.go
+++ b/action_create.go
@@ -29,7 +29,6 @@ func (s Service) Create(payload CreatePayload) {
 	// Get document
 	doc := Audit{
 		ID:       mongodb.NewObjectID(),
-		Source:   s.Source,
 		Target:   payload.Target,
 		TargetID: payload.TargetID,
 		Action:   payload.Action,
diff --git a/action_query.go b/action_query.go
index 9c13095..65569c9 100644
--- a/action_query.go
+++ b/action_query.go
@@ -26,7 +26,6 @@ func (s Service) All(query AllQuery) []Audit {
 
 	// Find db
 	cursor, err := s.DB.Collection(colName).Find(ctx, bson.D{
-		{"source", s.Source},
 		{"target", query.Target},
 		{"targetId", query.TargetID},
 	}, &options.FindOptions{
diff --git a/audit.go b/audit.go
index cec6ae9..5c29906 100644
--- a/audit.go
+++ b/audit.go
@@ -15,8 +15,6 @@ type MongoDBConfig struct {
 
 // Config ...
 type Config struct {
-	// Source of server, e.g: selly
-	Source string
 	// Targets: staff, article, ...
 	Targets []string
 	// MongoDB config, for save documents
@@ -33,8 +31,8 @@ var s *Service
 
 // NewInstance ...
 func NewInstance(config Config) error {
-	if config.Source == "" || len(config.Targets) == 0 || config.MongoDB.Host == "" {
-		return errors.New("please provide all necessary information: source, targets, mongodb")
+	if len(config.Targets) == 0 || config.MongoDB.Host == "" {
+		return errors.New("please provide all necessary information: targets, mongodb")
 	}
 
 	// Connect MongoDB
diff --git a/constant.go b/constant.go
deleted file mode 100644
index 101f1eb..0000000
--- a/constant.go
+++ /dev/null
@@ -1,8 +0,0 @@
-package audit
-
-// List actions
-const (
-	ActionCreate            = "create"
-	ActionUpdate            = "update"
-	ActionUpdatePermissions = "update-permissions"
-)
diff --git a/db_index.go b/db_index.go
index 4ff1dd0..a503f4c 100644
--- a/db_index.go
+++ b/db_index.go
@@ -6,9 +6,9 @@ import (
 
 func (s Service) indexDB() {
 	// Index key
-	commonIndex := mongodb.NewIndexKey("source", "target", "targetId")
+	commonIndex := mongodb.NewIndexKey("target", "targetId")
 
-	// Index all allowed sources
+	// Index all targets
 	for _, target := range s.Targets {
 		mongodb.CreateIndex(getColName(target), commonIndex)
 	}
diff --git a/db_model.go b/db_model.go
index 5a17ecc..e0aaecf 100644
--- a/db_model.go
+++ b/db_model.go
@@ -9,7 +9,6 @@ import (
 // Audit ...
 type Audit struct {
 	ID        primitive.ObjectID `bson:"_id" json:"id"`
-	Source    string             `bson:"source" json:"source"`
 	Target    string             `bson:"target" json:"target"`
 	TargetID  string             `bson:"targetId" json:"targetId"`
 	Action    string             `bson:"action" json:"action"`