diff --git a/src/lang/serbian.txt b/src/lang/serbian.txt
--- a/src/lang/serbian.txt
+++ b/src/lang/serbian.txt
@@ -5284,6 +5284,8 @@ STR_ERROR_CAN_T_COPY_ORDER_LIST                                 :{WHITE}Lista naredbi se ne može kopirati...
 STR_ERROR_TOO_FAR_FROM_PREVIOUS_DESTINATION                     :{WHITE}... previše udaljeno od prethodne destinacije
 STR_ERROR_AIRCRAFT_NOT_ENOUGH_RANGE                             :{WHITE}... letelica nema dovoljan domet
 
+# Extra messages which go on the third line of errors, explaining why orders failed
+
 # Timetable related errors
 STR_ERROR_CAN_T_TIMETABLE_VEHICLE                               :{WHITE}Raspored se ne može dodeliti vozilu...
 STR_ERROR_TIMETABLE_ONLY_WAIT_AT_STATIONS                       :{WHITE}Vozila mogu čekati samo na stanicama