diff --git a/artiq/firmware/Cargo.lock b/artiq/firmware/Cargo.lock
index 5f68ddb78..caf0d005f 100644
--- a/artiq/firmware/Cargo.lock
+++ b/artiq/firmware/Cargo.lock
@@ -1,3 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
 [[package]]
 name = "alloc_list"
 version = "0.0.0"