diff --git a/README.md b/README.md
index f18f32e..d802ba3 100644
--- a/README.md
+++ b/README.md
@@ -39,7 +39,7 @@ If any of the required information is not provided through environment variables
 - `--cluster value`: Specifies the ECS cluster name. Default is `$ECSEXEC_CLUSTER`.
 - `--service value`: Specifies the ECS service name. Default is `$ECSEXEC_SERVICE`.
 - `--container value`: Specifies the container name. Default is `$ECSEXEC_CONTAINER`.
-- `--command value`: Specifies the login shell. Default is /bin/sh, and it can be overridden by `$ESCEXEC_COMMAND`.
+- `--command value`: Specifies the login shell. Default is /bin/sh, and it can be overridden by `$ECSEXEC_COMMAND`.
 - `--help, -h`: Displays the help message.
 
 ## Examples
@@ -67,7 +67,7 @@ You can customize the behavior of the ecsexec command using environment variable
 - `ECSEXEC_CLUSTER`: ECS cluster name
 - `ECSEXEC_SERVICE`: ECS service name
 - `ECSEXEC_CONTAINER`: Container name
-- `ESCEXEC_COMMAND`: Login shell
+- `ECSEXEC_COMMAND`: Login shell
 
 ## License
 This project is licensed under the [MIT License](https://github.com/Taiki130/ecsexec?tab=MIT-1-ov-file#readme). See the LICENSE file for details.
diff --git a/pkg/cli/app.go b/pkg/cli/app.go
index ed3d4af..446f89b 100644
--- a/pkg/cli/app.go
+++ b/pkg/cli/app.go
@@ -45,7 +45,7 @@ func (runner *Runner) Run(ctx context.Context, args ...string) error {
 			&cli.StringFlag{
 				Name:    "command, cmd",
 				Usage:   "login shell. default: /bin/sh",
-				EnvVars: []string{"ESCEXEC_COMMAND"},
+				EnvVars: []string{"ECSEXEC_COMMAND"},
 			},
 		},
 	}