diff --git a/src/modules/acc/README b/src/modules/acc/README
index 878623d24fb..1ea4e6f98d0 100644
--- a/src/modules/acc/README
+++ b/src/modules/acc/README
@@ -529,6 +529,11 @@ Note
    information given will not be stored in the CDR as they cannot be
    accessed by the end of the call when the CDR is logged.
 
+   The dialog module needs to be engaged on the dialogs that should be
+   accounted, that they will be tracked by the server. This is usally done
+   by calling the function dlg_manage() or setting the dlg_flag. Refer to
+   the documentation of the dialog module for more information.
+
    Sometimes, dialogs expire because the UA has a problem and a final
    message is never transmitted. You can toggle on/off the generation of
    CDR-based logging in such cases with only the dlg_vars showing by using