diff --git a/src/lang/bulgarian.txt b/src/lang/bulgarian.txt
--- a/src/lang/bulgarian.txt
+++ b/src/lang/bulgarian.txt
@@ -2348,6 +2348,8 @@ STR_LINKGRAPH_LEGEND_UNUSED                                     :{TINY_FONT}{BLACK}неизползван
 STR_LINKGRAPH_LEGEND_SATURATED                                  :{TINY_FONT}{BLACK}наситен
 STR_LINKGRAPH_LEGEND_OVERLOADED                                 :{TINY_FONT}{BLACK}претоварен
 
+# Linkgraph tooltip
+
 # Base for station construction window(s)
 STR_STATION_BUILD_COVERAGE_AREA_TITLE                           :{BLACK}Маркиране на Отбелязаната зона
 STR_STATION_BUILD_COVERAGE_OFF                                  :{BLACK}Изключен