diff --git a/cmd/enbas/add.go b/cmd/enbas/add.go
new file mode 100644
index 0000000..096ee66
--- /dev/null
+++ b/cmd/enbas/add.go
@@ -0,0 +1,72 @@
+package main
+
+import (
+	"errors"
+	"flag"
+	"fmt"
+
+	"codeflow.dananglin.me.uk/apollo/enbas/internal/client"
+)
+
+type addCommand struct {
+	*flag.FlagSet
+
+	toResourceType string
+	listID         string
+	accountIDs     accountIDs
+}
+
+func newAddCommand(name, summary string) *addCommand {
+	emptyArr := make([]string, 0, 3)
+
+	command := addCommand{
+		FlagSet:    flag.NewFlagSet(name, flag.ExitOnError),
+		accountIDs: accountIDs(emptyArr),
+	}
+
+	command.StringVar(&command.toResourceType, "add-to", "", "specify the type of resource to add to")
+	command.StringVar(&command.listID, listIDFlag, "", "the ID of the list to add to")
+	command.Var(&command.accountIDs, "account-id", "the ID of the account to add to the list")
+
+	command.Usage = commandUsageFunc(name, summary, command.FlagSet)
+
+	return &command
+}
+
+func (c *addCommand) Execute() error {
+	if c.toResourceType == "" {
+		return flagNotSetError{flagText: "add-to"}
+	}
+
+	funcMap := map[string]func(*client.Client) error{
+		listResource: c.addAccountsToList,
+	}
+
+	doFunc, ok := funcMap[c.toResourceType]
+	if !ok {
+		return unsupportedResourceTypeError{resourceType: c.toResourceType}
+	}
+
+	gtsClient, err := client.NewClientFromConfig()
+	if err != nil {
+		return fmt.Errorf("unable to create the GoToSocial client; %w", err)
+	}
+
+	return doFunc(gtsClient)
+}
+
+func (c *addCommand) addAccountsToList(gtsClient *client.Client) error {
+	if c.listID == "" {
+		return flagNotSetError{flagText: listIDFlag}
+	}
+
+	if len(c.accountIDs) == 0 {
+		return errors.New("no account IDs has been specified")
+	}
+
+	if err := gtsClient.AddAccountsToList(c.listID, []string(c.accountIDs)); err != nil {
+		return fmt.Errorf("unable to add the accounts to the list; %w", err)
+	}
+
+	return nil
+}
diff --git a/cmd/enbas/flags.go b/cmd/enbas/flags.go
new file mode 100644
index 0000000..4856a45
--- /dev/null
+++ b/cmd/enbas/flags.go
@@ -0,0 +1,17 @@
+package main
+
+import "strings"
+
+type accountIDs []string
+
+func (a *accountIDs) String() string {
+	return strings.Join(*a, ", ")
+}
+
+func (a *accountIDs) Set(value string) error {
+	if len(value) > 0 {
+		*a = append(*a, value)
+	}
+
+	return nil
+}
diff --git a/cmd/enbas/main.go b/cmd/enbas/main.go
index 5430a0d..b541d7b 100644
--- a/cmd/enbas/main.go
+++ b/cmd/enbas/main.go
@@ -52,6 +52,7 @@ func run() error {
 		deleteResource string = "delete"
 		updateResource string = "update"
 		whoami         string = "whoami"
+		add            string = "add"
 	)
 
 	summaries := map[string]string{
@@ -63,6 +64,7 @@ func run() error {
 		deleteResource: "delete a specific resource",
 		updateResource: "update a specific resource",
 		whoami:         "print the account that you are currently logged in to",
+		add:            "add a resource to another resource",
 	}
 
 	flag.Usage = enbasUsageFunc(summaries)
@@ -97,6 +99,8 @@ func run() error {
 		executor = newUpdateCommand(updateResource, summaries[updateResource])
 	case whoami:
 		executor = newWhoAmICommand(whoami, summaries[whoami])
+	case add:
+		executor = newAddCommand(add, summaries[add])
 	default:
 		flag.Usage()
 		return fmt.Errorf("unknown subcommand %q", subcommand)