diff --git a/src/lang/thai.txt b/src/lang/thai.txt
--- a/src/lang/thai.txt
+++ b/src/lang/thai.txt
@@ -2447,6 +2447,8 @@ STR_LINKGRAPH_LEGEND_UNUSED                                     :{TINY_FONT}{BLACK}น้อย
 STR_LINKGRAPH_LEGEND_SATURATED                                  :{TINY_FONT}{BLACK}สมดุล
 STR_LINKGRAPH_LEGEND_OVERLOADED                                 :{TINY_FONT}{BLACK}หนาแน่น
 
+# Linkgraph tooltip
+
 # Base for station construction window(s)
 STR_STATION_BUILD_COVERAGE_AREA_TITLE                           :{BLACK}แสดงพื้นที่ให้บริการ
 STR_STATION_BUILD_COVERAGE_OFF                                  :{BLACK}ปิด