diff --git a/selftest/util_test.ok b/selftest/util_test.ok
new file mode 100644
index 0000000..c2c5f87
--- /dev/null
+++ b/selftest/util_test.ok
@@ -0,0 +1,5 @@
+- expect the same hashes on every test run
+a9993e364706816aba3e25717850c26c9cd0d89d
+356a192b7913b04c54574d18c28d46e6395428ab
+40bd001563085fc35165329ea1ff5c5ecbdbbeef
+c129b324aee662b04eccf68babba85851346dff9