diff --git a/main.cpp b/main.cpp
index 20a9414..e9ecbd3 100644
--- a/main.cpp
+++ b/main.cpp
@@ -38,13 +38,19 @@ input_data(istream& in, bool prompt) {
     return local;
 };
 
-int main() {
+int main(int argc, char* argv[]) {
 
     std::string fill = "red";
     std::string stroke = "#000000";
 
     curl_global_init(CURL_GLOBAL_ALL);
 
+    if (argc > 1) {
+        for (size_t i=0; i < argc; i++) {
+            cerr << "argv[" << i << "] = " << argv[i] << "\n";
+        }
+        return 0;
+    }
 
     auto in = input_data(cin, true);
     auto bins = make_histogram(in.numbers, in.bin_count);