diff --git a/src/auditor/taler-auditor-httpd_deposit-confirmation.c b/src/auditor/taler-auditor-httpd_deposit-confirmation.c
index 4a8890e9b..656b4fb7d 100644
--- a/src/auditor/taler-auditor-httpd_deposit-confirmation.c
+++ b/src/auditor/taler-auditor-httpd_deposit-confirmation.c
@@ -68,7 +68,7 @@ verify_and_execute_deposit_confirmation (struct MHD_Connection *connection,
                                        "master_sig (expired)");
   }
 
-  /* TODO: consider having an in-memory cache of already
+  /* TODO (#6052): consider having an in-memory cache of already
      verified exchange signing keys, this could save us
      a signature check AND a database transaction per
      operation. */