diff --git a/.github/CODE_OF_CONDUCT.md b/.github/CODE_OF_CONDUCT.md
index 4f84d10fe14..42e0723459c 100644
--- a/.github/CODE_OF_CONDUCT.md
+++ b/.github/CODE_OF_CONDUCT.md
@@ -1,3 +1,9 @@
 # Code of Conduct
 
+If you use an LLM (Large Language Model, like ChatGPT, Claude, GitHub Copilot,
+or Llama) to make a contribution then you must say so in your contribution and
+you must carefully review your contribution for correctness before sharing it.
+If you share un-reviewed LLM-generated content then you will be immediately
+banned.
+
 [Contributor Covenant Code Of Conduct](https://www.contributor-covenant.org/version/2/1/code_of_conduct/).
diff --git a/assets/chezmoi.io/docs/developer-guide/index.md b/assets/chezmoi.io/docs/developer-guide/index.md
index d2660dac557..1dd68519267 100644
--- a/assets/chezmoi.io/docs/developer-guide/index.md
+++ b/assets/chezmoi.io/docs/developer-guide/index.md
@@ -1,5 +1,13 @@
 # Developer guide
 
+!!! warning
+
+    If you use an LLM (Large Language Model, like ChatGPT, Claude, GitHub Copilot,
+    or Llama) to make a contribution then you must say so in your contribution and
+    you must carefully review your contribution for correctness before sharing it.
+    If you share un-reviewed LLM-generated content then you will be immediately
+    banned.
+
 chezmoi is written in [Go](https://golang.org) and development happens on
 [GitHub](https://github.com). chezmoi is a standard Go project, using standard
 Go tooling. chezmoi requires Go 1.22 or later.