diff --git a/src/lang/frisian.txt b/src/lang/frisian.txt
--- a/src/lang/frisian.txt
+++ b/src/lang/frisian.txt
@@ -4299,6 +4299,8 @@ STR_ERROR_CAN_T_COPY_ORDER_LIST         
 STR_ERROR_TOO_FAR_FROM_PREVIOUS_DESTINATION                     :{WHITE}... te fier fan lêste bestimming
 STR_ERROR_AIRCRAFT_NOT_ENOUGH_RANGE                             :{WHITE}... fleantúch hat in te lege aksjeradius
 
+# Extra messages which go on the third line of errors, explaining why orders failed
+
 # Timetable related errors
 STR_ERROR_CAN_T_TIMETABLE_VEHICLE                               :{WHITE}Kin gjin tsjinst meitsje
 STR_ERROR_TIMETABLE_ONLY_WAIT_AT_STATIONS                       :{WHITE}Auto's kinne allinech op stations wachtsje