diff --git a/ptest/Cargo.lock b/ptest/Cargo.lock
index 2783b610..940c8089 100644
--- a/ptest/Cargo.lock
+++ b/ptest/Cargo.lock
@@ -1,3 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
 [[package]]
 name = "aho-corasick"
 version = "0.6.9"
diff --git a/sim/Cargo.lock b/sim/Cargo.lock
index 55ffdd60..a51f757d 100644
--- a/sim/Cargo.lock
+++ b/sim/Cargo.lock
@@ -1,3 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
 [[package]]
 name = "aes-ctr"
 version = "0.2.0"