diff --git a/src/currencyExchange.h b/src/currencyExchange.h
new file mode 100644
index 0000000..406b0ed
--- /dev/null
+++ b/src/currencyExchange.h
@@ -0,0 +1,5 @@
+#include <stdio.h>
+
+#define CURRENT_USD_RATE_OF_ONE_EURO 1.07
+
+float toUSD(float euro);
\ No newline at end of file