diff --git a/src/lang/slovak.txt b/src/lang/slovak.txt
--- a/src/lang/slovak.txt
+++ b/src/lang/slovak.txt
@@ -2677,6 +2677,8 @@ STR_LINKGRAPH_LEGEND_UNUSED                                     :{TINY_FONT}{BLACK}nevyužité
 STR_LINKGRAPH_LEGEND_SATURATED                                  :{TINY_FONT}{BLACK}vyťažené
 STR_LINKGRAPH_LEGEND_OVERLOADED                                 :{TINY_FONT}{BLACK}preťažené
 
+# Linkgraph tooltip
+
 # Base for station construction window(s)
 STR_STATION_BUILD_COVERAGE_AREA_TITLE                           :{BLACK}Ukázať oblasť pokrytia
 STR_STATION_BUILD_COVERAGE_OFF                                  :{BLACK}Vyp.