diff --git a/main.cpp b/main.cpp
index 394310e..40f9f03 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,5 +1,6 @@
 #include <iostream>
 #include <vector>
+#include <sstream>
 #include "histogram.h"
 #include "svg.h"
 
@@ -37,7 +38,15 @@ Input input_data(istream& in, bool prompt)
     return input;
 }
 
-int main() {
+int main(int argc, char* argv[]) {
+    if (argc > 1) {
+        cerr << "argc = " << argc << endl;
+        for (int i = 0; i < argc; i++) {
+            cerr << "argv[" << i << "] = " << argv[i] << endl;
+        }
+        return 0;
+    }
+
     auto in = input_data(cin, true);
     auto bins = make_histogram(in.numbers, in.bin_count);
     show_histogram_svg(bins);