diff --git a/src/auto4_lua.cpp b/src/auto4_lua.cpp
index b8ef66615..943495de1 100644
--- a/src/auto4_lua.cpp
+++ b/src/auto4_lua.cpp
@@ -267,6 +267,33 @@ namespace {
 		return 4;
 	}
 
+	int project_properties(lua_State *L)
+	{
+		const agi::Context *c = get_context(L);
+		if (!c)
+			lua_pushnil(L);
+		else {
+			lua_createtable(L, 0, 14);
+#define PUSH_FIELD(name) set_field(L, #name, c->ass->Properties.name)
+			PUSH_FIELD(automation_scripts);
+			PUSH_FIELD(export_filters);
+			PUSH_FIELD(export_encoding);
+			PUSH_FIELD(style_storage);
+			PUSH_FIELD(audio_file);
+			PUSH_FIELD(video_file);
+			PUSH_FIELD(timecodes_file);
+			PUSH_FIELD(keyframes_file);
+			PUSH_FIELD(video_zoom);
+			PUSH_FIELD(ar_value);
+			PUSH_FIELD(scroll_position);
+			PUSH_FIELD(active_row);
+			PUSH_FIELD(ar_mode);
+			PUSH_FIELD(video_position);
+#undef PUSH_FIELD
+		}
+		return 1;
+	}
+
 	class LuaFeature {
 		int myid = 0;
 	protected:
@@ -422,7 +449,7 @@ namespace {
 
 		// make "aegisub" table
 		lua_pushstring(L, "aegisub");
-		lua_createtable(L, 0, 12);
+		lua_createtable(L, 0, 13);
 
 		set_field<LuaCommand::LuaRegister>(L, "register_macro");
 		set_field<LuaExportFilter::LuaRegister>(L, "register_filter");
@@ -437,6 +464,7 @@ namespace {
 		set_field<clipboard_init>(L, "__init_clipboard");
 		set_field<get_file_name>(L, "file_name");
 		set_field<get_translation>(L, "gettext");
+		set_field<project_properties>(L, "project_properties");
 
 		// store aegisub table to globals
 		lua_settable(L, LUA_GLOBALSINDEX);
diff --git a/src/subs_controller.h b/src/subs_controller.h
index 2e5987501..5425e0871 100644
--- a/src/subs_controller.h
+++ b/src/subs_controller.h
@@ -54,10 +54,6 @@ class SubsController {
 	agi::signal::Signal<agi::fs::path> FileOpen;
 	/// The file has been saved
 	agi::signal::Signal<> FileSave;
-	/// The file is about to be saved
-	/// This signal is intended for adding metadata which is awkward or
-	/// expensive to always keep up to date
-	agi::signal::Signal<> UpdateProperties;
 
 	/// The filename of the currently open file, if any
 	agi::fs::path filename;
@@ -111,6 +107,11 @@ public:
 	/// Can the file be saved in its current format?
 	bool CanSave() const;
 
+	/// The file is about to be saved
+	/// This signal is intended for adding metadata which is awkward or
+	/// expensive to always keep up to date
+	agi::signal::Signal<> UpdateProperties;
+
 	DEFINE_SIGNAL_ADDERS(FileOpen, AddFileOpenListener)
 	DEFINE_SIGNAL_ADDERS(FileSave, AddFileSaveListener)