diff --git a/eng/common/AGENTS.md b/eng/common/AGENTS.md
new file mode 100644
index 00000000000..a5ed8f72926
--- /dev/null
+++ b/eng/common/AGENTS.md
@@ -0,0 +1,5 @@
+# `eng/common`
+
+Files under `eng/common` come from [Arcade](https://github.com/dotnet/arcade).
+Edits in `eng/common` will be overwritten by automation unless the changes are made directly in the Arcade repository.
+For more information, see the [Arcade documentation](https://github.com/dotnet/arcade/tree/main/Documentation).