diff --git a/cmd/headscale/cli/api_key.go b/cmd/headscale/cli/api_key.go
index 06099aa..aa056c5 100644
--- a/cmd/headscale/cli/api_key.go
+++ b/cmd/headscale/cli/api_key.go
@@ -23,7 +23,7 @@ func init() {
 	apiKeysCmd.AddCommand(listAPIKeys)
 
 	createAPIKeyCmd.Flags().
-		DurationP("expiration", "e", DefaultAPIKeyExpiry, "Human-readable expiration of the key (30m, 24h, 365d...)")
+		DurationP("expiration", "e", DefaultAPIKeyExpiry, "Human-readable expiration of the key (e.g. 30m, 24h)")
 
 	apiKeysCmd.AddCommand(createAPIKeyCmd)
 
diff --git a/cmd/headscale/cli/preauthkeys.go b/cmd/headscale/cli/preauthkeys.go
index 950cbcc..7efb72f 100644
--- a/cmd/headscale/cli/preauthkeys.go
+++ b/cmd/headscale/cli/preauthkeys.go
@@ -31,7 +31,7 @@ func init() {
 	createPreAuthKeyCmd.PersistentFlags().
 		Bool("ephemeral", false, "Preauthkey for ephemeral nodes")
 	createPreAuthKeyCmd.Flags().
-		DurationP("expiration", "e", DefaultPreAuthKeyExpiry, "Human-readable expiration of the key (30m, 24h, 365d...)")
+		DurationP("expiration", "e", DefaultPreAuthKeyExpiry, "Human-readable expiration of the key (e.g. 30m, 24h)")
 }
 
 var preauthkeysCmd = &cobra.Command{