diff --git a/flash.h b/flash.h
index e036387..ec28064 100644
--- a/flash.h
+++ b/flash.h
@@ -172,7 +172,15 @@
  * byte of device ID is related to log(bitsize) at least for some chips.
  */
 #define ST_ID			0x20	/* ST */
+#define ST_M25P05A		0x2010
+#define ST_M25P10A		0x2011
+#define ST_M25P20		0x2012
+#define ST_M25P40		0x2013
 #define ST_M25P80		0x2014
+#define ST_M25P16		0x2015
+#define ST_M25P32		0x2016
+#define ST_M25P64		0x2017
+#define ST_M25P128		0x2018
 #define ST_M50FLW040A		0x08
 #define ST_M50FLW040B		0x28
 #define ST_M50FLW080A		0x80