diff --git a/goodwe_controller/test_safety78.py b/goodwe_controller/test_safety78.py
index cd10119..8cecbb2 100644
--- a/goodwe_controller/test_safety78.py
+++ b/goodwe_controller/test_safety78.py
@@ -16,6 +16,9 @@ DECISIONS/SAFETY-78-drain-at-two.md has the record.
    no grid charge, and its card says why.
 4. The peak guard binds during a drain, and the arbiter's order holds.
 5. N=1 is byte-identical to release/1.0 5a4cdc2, and the harness bites.
+
+Mutations (MUTATION.md, purged copies, graded over this file and the named
+tests) are listed in the pull request.
 """
 
 import functools