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diff --git a/bug/list b/bug/list
index d7fcfa9..f4d1081 100644
--- a/bug/list
+++ b/bug/list
@@ -1,3 +1,7 @@
+! Need to use SERIALIZABLE isolation level on all databases
+
+  See private email with subject like "ODB concurrency behavior".
+
 ! Add note on PG "transaction terminated after failed statement" [doc]
 
   For instance, the schema_catalog::migrate() logic doesn't work in case