Clarify tty requirement for watch mode in README

Author: scriptogre

README.md

@@ -14,19 +14,25 @@ No more **Node.JS**. No more **manual downloads of the CLI**.
       tailwindcss:
         # You can also use pinned versions, e.g. `:4.1.7`
         image: ghcr.io/scriptogre/tailwindcss:latest
+        tty: true  # Required for watch mode
         volumes:
           - .:/app
         command: -i ./input.css -o ./output.css --watch
     ```
 
-3.  Or run `docker run` command:
+3.  Or run `docker run` command (note the `-t` flag is required for watch mode):
 ```bash
-docker run \ 
+docker run -t \
   -v "$(pwd)":/app \
-  ghcr.io/scriptogre/tailwindcss:latest \ 
+  ghcr.io/scriptogre/tailwindcss:latest \
   -i ./input.css -o ./output.css --watch
 ```
 
+### **Watch Mode Requirement**
+- For watch mode (`--watch`), you must:
+  - In `docker-compose.yml`: Set `tty: true`
+  - In `docker run`: Use the `-t` flag
+- Without these, the container will exit after the first build
 
 ### **Notes:**
 - Make sure you mount all source files (`*.html`, `*.css`, `*.js`, …) to `/app`, so Tailwind’s watcher can see them within the container.