diff --git a/neko/messages/temp_upgrade_node_to_v21 b/neko/messages/temp_upgrade_node_to_v21
new file mode 100644
index 000000000..f4bacc2ce
--- /dev/null
+++ b/neko/messages/temp_upgrade_node_to_v21
@@ -0,0 +1,8 @@
+ ----------------------------------------------------
+| For systemd users:                                |
+| This Firefish flavor currently requires Node v21  |
+| PLEASE CHECK YOUR NODE VERSION BEFORE UPGRADING!! |
+|                                                   |
+| For the detailed explanation, see:                |
+| https://post.naskya.net/notes/9ntn882tzcfe1qm6    |
+ ----------------------------------------------------