diff --git a/gnucash/report/report-system/trep-engine.scm b/gnucash/report/report-system/trep-engine.scm
index 4bd2433906..f7d020a9fd 100644
--- a/gnucash/report/report-system/trep-engine.scm
+++ b/gnucash/report/report-system/trep-engine.scm
@@ -1404,6 +1404,8 @@ be excluded from periodic reporting.")
              (data (if (and (any (lambda (c) (eq? 'bal-bf (vector-ref c 5)))
                                  calculated-cells)
                             (memq sortkey ACCOUNT-SORTING-TYPES))
+                       ;; Translators: Balance b/f stands for "Balance
+                       ;; brought forward".
                        (string-append data ": " (_ "Balance b/f"))
                        data))
              (renderer-fn (keylist-get-info