diff --git a/src/lang/polish.txt b/src/lang/polish.txt
--- a/src/lang/polish.txt
+++ b/src/lang/polish.txt
@@ -2997,6 +2997,8 @@ STR_LINKGRAPH_LEGEND_UNUSED                                     :{TINY_FONT}{BLACK}nieużywany
 STR_LINKGRAPH_LEGEND_SATURATED                                  :{TINY_FONT}{BLACK}nasycony
 STR_LINKGRAPH_LEGEND_OVERLOADED                                 :{TINY_FONT}{BLACK}przeładowany
 
+# Linkgraph tooltip
+
 # Base for station construction window(s)
 STR_STATION_BUILD_COVERAGE_AREA_TITLE                           :{BLACK}Podświetlaj zasięg
 STR_STATION_BUILD_COVERAGE_OFF                                  :{BLACK}Wył.