diff --git a/README.md b/README.md
new file mode 100644
index 0000000..9b7e905
--- /dev/null
+++ b/README.md
@@ -0,0 +1,68 @@
+# Go Todo CLI App
+
+A simple command-line Todo application written in Go. Todos are stored in a local JSON file.
+
+## Features
+
+- Add new todos with a title and description
+- List all todos, grouped by incomplete and completed
+- Mark todos as completed
+- Remove todos by ID
+- Data is persisted in `todos.json`
+
+## Usage
+
+Build the app:
+
+```sh
+go build -o todo
+```
+
+### Add a Todo
+
+```sh
+./todo -action=add -title="Buy milk" -description="Get 2 liters of milk"
+```
+
+### List Todos
+
+```sh
+./todo -action=list
+```
+
+### Complete a Todo
+
+```sh
+./todo -action=complete -id=1
+```
+
+### Remove a Todo
+
+```sh
+./todo -action=remove -id=1
+```
+
+## Flags
+
+- `-action` (add, remove, list, complete) — What you want to do
+- `-title` — Title for the todo (required for add)
+- `-description` — Description for the todo (required for add)
+- `-id` — ID of the todo (required for remove and complete)
+
+## Example
+
+```sh
+./todo -action=add -title="Read Go book" -description="Finish chapter 3"
+./todo -action=list
+./todo -action=complete -id=1
+./todo -action=remove -id=1
+```
+
+## Next Improvements
+
+- Use a CLI library like [cobra](https://github.com/spf13/cobra) for better UX
+- Add edit and search features
+- Add unit tests
+- Improve error handling
+- Use a database instead of a JSON file for storage
+- Add binary release for different platforms and make it available through Homebrew, Winget and Apt.
diff --git a/main.go b/main.go
index 1e2bf9f..e1d4c5d 100644
--- a/main.go
+++ b/main.go
@@ -54,12 +54,12 @@ func checkFile() {
 	}
 }
 
-func saveTodoList(todos []Todo) {
+func saveTodoList(todos []Todo) error {
 	writeBytes, err := json.Marshal(todos)
 	if err != nil {
-		log.Fatal("There was a problem:", err)
+		return err
 	}
-	os.WriteFile(fileName, writeBytes, 0666)
+	return os.WriteFile(fileName, writeBytes, 0666)
 }
 
 func getAllTodos() []Todo {