diff --git a/src/lang/chuvash.txt b/src/lang/chuvash.txt
--- a/src/lang/chuvash.txt
+++ b/src/lang/chuvash.txt
@@ -1056,6 +1056,8 @@ STR_CONTENT_DETAIL_VERSION                                      :{SILVER}Верси: {WHITE}{STRING}
 
 # Linkgraph legend window and linkgraph legend in smallmap
 
+# Linkgraph tooltip
+
 # Base for station construction window(s)
 
 # Join station window