diff --git a/builder/modal-builder/README.md b/builder/modal-builder/README.md
index 4dea6b1..9670d41 100644
--- a/builder/modal-builder/README.md
+++ b/builder/modal-builder/README.md
@@ -2,21 +2,51 @@
 
 This is a standalone docker fast api app that will takes in require snapshot of the machine and build it as a new modal apps and returns back the deployment url.
 
-Environment variable, get it from you [modal accounts](https://modal.com/bennykok/settings/tokens)
+## Environment variable, get it from you [modal accounts](https://modal.com/bennykok/settings/tokens)
 
 ```shellscript
 MODAL_TOKEN_ID=
 MODAL_TOKEN_SECRET=
 ```
 
-To run locally
+## To run locally
 
 ```
 docker build -t bennykok/comfydeploy-builder:dev . && docker run --env-file .env -p 8080:8080 bennykok/comfydeploy-builder:dev
 ```
 
-To deploy
+## Before Deploy to Fly.io
+## Fly.io installation
 
+### Mac/Liunx
+If you have the Homebrew package manager installed
+```
+brew install flyctl // mac only
+```
+If not, you can run the install script:
+```
+curl -L https://fly.io/install.sh | sh
+```
+
+### Window
+Run the PowerShell install script:
+```
+pwsh -Command "iwr https://fly.io/install.ps1 -useb | iex"
+```
+
+## Set Env Key into Fly.io
+```
+fly secrets set MODAL_TOKEN_ID=
+fly secrets set MODAL_TOKEN_SECRET=
+```
+
+## To deploy
+
+if you're first time deploy, run this
+```
+fly launch
+```
+if not, run this instead
 ```
 fly deploy
 ```
\ No newline at end of file