diff --git a/scripts/hooks/on-exit b/scripts/hooks/on-exit
index 781f846f1..4e9fe952c 100755
--- a/scripts/hooks/on-exit
+++ b/scripts/hooks/on-exit
@@ -9,6 +9,8 @@
 
 # Output:
 # - all emitted non-JSON lines are considered feedback messages
+# - The onExit event occurs too late to allow any changes, so the input is not
+#   to be modified
 echo on-exit
 
 # Exit: