diff --git a/main.cpp b/main.cpp
index 715b924..10e0bf8 100644
--- a/main.cpp
+++ b/main.cpp
@@ -39,6 +39,10 @@ int main(int argc, char* argv[]) {
     if (argc > 1){
         cerr << "argv[0] = " << argv[0] << "argc = " << argc;
         return 0;
+    if (argc > 1) {
+        for (size_t i = 0; i < argc; i++) {
+            cerr << "argv [" << i << "] = " << argv[i];
+        }
     }
     auto in = input_data(cin, true);
     auto bins = make_histogram(in.numbers, in.bin_count);