diff --git a/src/lang/korean.txt b/src/lang/korean.txt
--- a/src/lang/korean.txt
+++ b/src/lang/korean.txt
@@ -2618,6 +2618,8 @@ STR_LINKGRAPH_LEGEND_UNUSED                                     :{TINY_FONT}{BLACK}이용 없음
 STR_LINKGRAPH_LEGEND_SATURATED                                  :{TINY_FONT}{BLACK}포화
 STR_LINKGRAPH_LEGEND_OVERLOADED                                 :{TINY_FONT}{BLACK}과포화
 
+# Linkgraph tooltip
+
 # Base for station construction window(s)
 STR_STATION_BUILD_COVERAGE_AREA_TITLE                           :{BLACK}역세권 표시
 STR_STATION_BUILD_COVERAGE_OFF                                  :{BLACK}끄기