diff --git a/README.md b/README.md
index 3cd1f5e..988d7fb 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,13 @@
 # wutzcalc
 
+> ## ⚠️ AI-generated code
+>
+> **Every file in this repository was written by an AI coding assistant.** It
+> has not been independently audited or reviewed line-by-line by a human. Before
+> running this in any setting where correctness matters (real money, real
+> events), read the code yourself, test the edge cases that matter to you, and
+> assume there are bugs. Use at your own risk.
+
 Festival drink-sale tracker. See [PLAN.md](PLAN.md) for architecture, [NOTES.md](NOTES.md)
 for the original requirements, and [TODO.md](TODO.md) for deferred work.