diff --git a/nu/milestone.nu b/nu/milestone.nu
index 45bc5cb..134b127 100644
--- a/nu/milestone.nu
+++ b/nu/milestone.nu
@@ -166,7 +166,7 @@ export def guess-milestone-for-issue [
 }
 
 # Create milestone for a repository by title, due_on, and description.
-export def create-milestone [
+export def --env create-milestone [
   repo: string,               # Github repository name
   title: string,              # Milestone title
   --due-on(-d): string,       # Milestone due date, format: yyyy/mm/dd
@@ -181,8 +181,7 @@ export def create-milestone [
   let result = gh api -X POST $'/repos/($repo)/milestones' -F $'title=($title)' ...$dueOnArg ...$descArg
   let milestone = $result | from json
   print $'Milestone (ansi p)($milestone.title)(ansi reset) with NO. (ansi p)($milestone.number)(ansi reset) was created successfully.'
-  print 'Set output for milestone create Github Action:'
-  echo $'milestone-number=($milestone.number)' | save --append $env.GITHUB_OUTPUT
+  echo $'milestone-number=($milestone.number)' o>> $env.GITHUB_OUTPUT
 }
 
 # Close milestone for a repository by title or number.