diff --git a/source.list b/source.list
index a4d2b141dd..83ad09ed62 100644
--- a/source.list
+++ b/source.list
@@ -628,6 +628,7 @@ ai/api/ai_rail.hpp
 ai/api/ai_railtypelist.hpp
 ai/api/ai_road.hpp
 ai/api/ai_sign.hpp
+ai/api/ai_signlist.hpp
 ai/api/ai_station.hpp
 ai/api/ai_stationlist.hpp
 ai/api/ai_subsidy.hpp
@@ -680,6 +681,7 @@ ai/api/ai_rail.cpp
 ai/api/ai_railtypelist.cpp
 ai/api/ai_road.cpp
 ai/api/ai_sign.cpp
+ai/api/ai_signlist.cpp
 ai/api/ai_station.cpp
 ai/api/ai_stationlist.cpp
 ai/api/ai_subsidy.cpp