diff --git a/cmd/set.go b/cmd/set.go
index 4e066cb..5d21950 100644
--- a/cmd/set.go
+++ b/cmd/set.go
@@ -22,7 +22,10 @@ THE SOFTWARE.
 package cmd
 
 import (
+	"fmt"
 	"io"
+	"strings"
+	"time"
 
 	"github.com/dgraph-io/badger/v4"
 	"github.com/spf13/cobra"
@@ -54,6 +57,20 @@ func set(cmd *cobra.Command, args []string) error {
 	if err != nil {
 		return err
 	}
+	ttlRaw, err := cmd.Flags().GetString("ttl")
+	if err != nil {
+		return err
+	}
+	var ttl time.Duration
+	if strings.TrimSpace(ttlRaw) != "" {
+		ttl, err = time.ParseDuration(ttlRaw)
+		if err != nil {
+			return fmt.Errorf("invalid ttl %q: %w", ttlRaw, err)
+		}
+		if ttl <= 0 {
+			return fmt.Errorf("ttl must be greater than zero")
+		}
+	}
 
 	trans := TransactionArgs{
 		key:      args[0],
@@ -64,6 +81,9 @@ func set(cmd *cobra.Command, args []string) error {
 			if secret {
 				entry = entry.WithMeta(metaSecret)
 			}
+			if ttlRaw != "" {
+				entry = entry.WithTTL(ttl)
+			}
 			return tx.SetEntry(entry)
 		},
 	}
@@ -74,4 +94,5 @@ func set(cmd *cobra.Command, args []string) error {
 func init() {
 	rootCmd.AddCommand(setCmd)
 	setCmd.Flags().Bool("secret", false, "Mark the stored value as a secret")
+	setCmd.Flags().String("ttl", "", "Expire the key after the provided duration (e.g. 24h, 30m)")
 }