diff --git a/src/currencyExchange.h b/src/currencyExchange.h
index 406b0ed..fe80c35 100644
--- a/src/currencyExchange.h
+++ b/src/currencyExchange.h
@@ -1,5 +1,7 @@
 #include <stdio.h>
 
 #define CURRENT_USD_RATE_OF_ONE_EURO 1.07
+#define CURRENT_GBP_RATE_OF_ONE_EURO 0.89
 
-float toUSD(float euro);
\ No newline at end of file
+float toUSD(float euro);
+float toGBP(float euro);
\ No newline at end of file