diff --git a/flash.h b/flash.h
index de4a210..4eae62b 100644
--- a/flash.h
+++ b/flash.h
@@ -143,6 +143,9 @@
 #define FEATURE_ERASED_ZERO	(1 << 17)
 #define FEATURE_NO_ERASE	(1 << 18)
 
+#define FEATURE_WRSR_EXT	(1 << 19)
+#define FEATURE_WRSR2		(1 << 20)
+
 #define ERASED_VALUE(flash)	(((flash)->chip->feature_bits & FEATURE_ERASED_ZERO) ? 0x00 : 0xff)
 
 enum test_state {