diff --git a/filla.nu b/filla.nu
index 231d682..4a00237 100755
--- a/filla.nu
+++ b/filla.nu
@@ -2,7 +2,7 @@
 
 def main [] {}
 
-def "main test" [search replace ...paths] {
+def "main rename_test" [search: string replace: string ...paths] {
 
   print $"search: ($search) replace: ($replace)"
 
@@ -20,7 +20,7 @@ def "main test" [search replace ...paths] {
   )
 }
 
-def "main rename" [search replace ...paths] {
+def "main rename" [search: string replace: string ...paths] {
 
   ($paths |