diff --git a/0012-on.initialize b/0012-on.initialize
index ec64394..d3cec22 100644
--- a/0012-on.initialize
+++ b/0012-on.initialize
@@ -1,10 +1,11 @@
 on.initialize = function(arg)
-	if #arg > 0 then
-		if is_absolute_path(arg[1]) then
-			Data_dir = arg[1]
-		else
-			Data_dir = App.current_dir..arg[1]
-		end
+	if #arg == 0 then
+		error('please provide a directory to browse')
+	end
+	if is_absolute_path(arg[1]) then
+		Data_dir = arg[1]
+	else
+		Data_dir = App.current_dir..arg[1]
 	end
 	print('reading articles from '..Data_dir)
 	if not file_exists(Data_dir) then
diff --git a/0152-Data_dir b/0152-Data_dir
index e162e0a..d74ed21 100644
--- a/0152-Data_dir
+++ b/0152-Data_dir
@@ -1 +1 @@
-Data_dir = App.save_dir .. 'data'
\ No newline at end of file
+Data_dir = nil