diff --git a/doc/sandbox/revert_me.mdwn b/doc/sandbox/revert_me.mdwn
index 2b1cd2f94..c3212ce71 100644
--- a/doc/sandbox/revert_me.mdwn
+++ b/doc/sandbox/revert_me.mdwn
@@ -1 +1,5 @@
 this looks good
+
+alas,
+
+    Error: you are not allowed to change sandbox/revert_me.mdwn