diff --git a/common/image.c b/common/image.c
index 06fdca1..4ec4744 100644
--- a/common/image.c
+++ b/common/image.c
@@ -95,6 +95,7 @@ static const table_entry_t uimage_arch[] = {
 
 static const table_entry_t uimage_os[] = {
 	{	IH_OS_INVALID,	"invalid",	"Invalid OS",		},
+	{       IH_OS_ARM_TRUSTED_FIRMWARE, "arm-trusted-firmware", "ARM Trusted Firmware"  },
 	{	IH_OS_LINUX,	"linux",	"Linux",		},
 #if defined(CONFIG_LYNXKDI) || defined(USE_HOSTCC)
 	{	IH_OS_LYNXOS,	"lynxos",	"LynxOS",		},
diff --git a/include/image.h b/include/image.h
index 127cfc5..e9c18ce 100644
--- a/include/image.h
+++ b/include/image.h
@@ -152,6 +152,7 @@ enum {
 	IH_OS_OSE,			/* OSE		*/
 	IH_OS_PLAN9,			/* Plan 9	*/
 	IH_OS_OPENRTOS,		/* OpenRTOS	*/
+	IH_OS_ARM_TRUSTED_FIRMWARE,     /* ARM Trusted Firmware */
 
 	IH_OS_COUNT,
 };