diff --git a/gtool.go b/gtool.go
index 567636c..a5f08a9 100644
--- a/gtool.go
+++ b/gtool.go
@@ -1,5 +1,8 @@
 package gtool
 
-func Add(x, y int) int {
-	return x + y
-}
+import "git.sre.ink/go/gtool/str"
+
+var (
+	//string tools
+	Str str.Str
+)