diff --git a/helper/mutex.go b/algo/mutex.go
similarity index 97%
rename from helper/mutex.go
rename to algo/mutex.go
index 0d17fe3..42c58bd 100644
--- a/helper/mutex.go
+++ b/algo/mutex.go
@@ -1,4 +1,4 @@
-package helper
+package algo
 
 import (
 	"sync"
diff --git a/algo/ucb.go b/algo/ucb.go
index 2bfe906..d4c0014 100644
--- a/algo/ucb.go
+++ b/algo/ucb.go
@@ -1,4 +1,4 @@
-package ucb
+package algo
 
 import (
 	"errors"