diff --git a/src/modules/tm/README b/src/modules/tm/README
index 0a8ea2d502f..708e7c7e0f0 100644
--- a/src/modules/tm/README
+++ b/src/modules/tm/README
@@ -1905,6 +1905,11 @@ branch_route[1] {
    the only way a script can add a new transaction in an atomic way.
    Typically, it is used to deploy a UAS.
 
+   Note that any flag operations (e.g. for accounting) after this function
+   has been called will be ignored. You can use the the tmx module
+   function t_flush_flags() to flush the altered flags to the already
+   created transaction.
+
    Example 1.55. t_newtran usage
 ...
 if (t_newtran()) {