1 files changed, 10 insertions, 3 deletions
diff --git a/MdePkg/Include/Pi/PiMultiPhase.h b/MdePkg/Include/Pi/PiMultiPhase.h
index bbba442b21..4f008ce939 100644
--- a/MdePkg/Include/Pi/PiMultiPhase.h
+++ b/MdePkg/Include/Pi/PiMultiPhase.h
@@ -92,9 +92,16 @@ typedef struct {
 } EFI_STATUS_CODE_DATA;
 
 
-//
-// Bit values for Authentication Status
-//
+///
+/// Bit values for Authentication Status
+///
+/// xx00 Image was not signed.
+/// xxx1 Platform security policy override. Assumes same meaning as 0010 (the image was signed, the
+///      signature was tested, and the signature passed authentication test).
+/// 0010 Image was signed, the signature was tested, and the signature passed authentication test.
+/// 0110 Image was signed and the signature was not tested.
+/// 1010 Image was signed, the signature was tested, and the signature failed the authentication test.
+///
 #define EFI_AUTH_STATUS_PLATFORM_OVERRIDE   0x01
 #define EFI_AUTH_STATUS_IMAGE_SIGNED        0x02
 #define EFI_AUTH_STATUS_NOT_TESTED          0x04