diff --git a/d-programming/countLettersInTextFile.d b/d-programming/countLettersInTextFile.d
index aebb3d7..471d23e 100644
--- a/d-programming/countLettersInTextFile.d
+++ b/d-programming/countLettersInTextFile.d
@@ -4,9 +4,9 @@ import std.ascii : isAlpha, isWhite;
 import std.file : read;
 import std.stdio : writefln;
 
-void main()
+void main(string[] argv)
 {
-	auto fileContent = cast(string)read("file.txt");
+	auto fileContent = cast(string)read(argv[1]);
 	auto totalLetters =
 		count(filter!(a => isAlpha(a) || isWhite(a))(fileContent));
 	auto percentage = (totalLetters * 100) / cast(double)fileContent.length;