diff --git a/src/PinChangeInterrupt.h b/src/PinChangeInterrupt.h
index 0cde827..b45267e 100644
--- a/src/PinChangeInterrupt.h
+++ b/src/PinChangeInterrupt.h
@@ -59,7 +59,7 @@ enum pcint_mode_t
 #include "PinChangeInterruptPins.h"
 
 #if !PCINT_NUM_USED_PORTS
-#error Please enable at least one PCINT port!
+#error Please enable at least one PCINT port and pin!
 #endif
 
 // manually include cpp files to save flash if only 1 ISR is present