diff --git a/boot/bootutil/include/bootutil/image.h b/boot/bootutil/include/bootutil/image.h
index 3e03f80dd..72a41c95d 100644
--- a/boot/bootutil/include/bootutil/image.h
+++ b/boot/bootutil/include/bootutil/image.h
@@ -101,6 +101,9 @@ struct flash_area;
 #define IMAGE_TLV_ECDSA_SIG         0x22   /* ECDSA of hash output */
 #define IMAGE_TLV_RSA3072_PSS       0x23   /* RSA3072 of hash output */
 #define IMAGE_TLV_ED25519           0x24   /* ed25519 of hash output */
+#define IMAGE_TLV_SIG_PURE          0x25   /* Indicator that attached signature has been prepared
+                                            * over image rather than its digest.
+                                            */
 #define IMAGE_TLV_ENC_RSA2048       0x30   /* Key encrypted with RSA-OAEP-2048 */
 #define IMAGE_TLV_ENC_KW            0x31   /* Key encrypted with AES-KW 128 or 256*/
 #define IMAGE_TLV_ENC_EC256         0x32   /* Key encrypted with ECIES-EC256 */
diff --git a/scripts/imgtool/image.py b/scripts/imgtool/image.py
index 5c4732b53..bb63f30c0 100644
--- a/scripts/imgtool/image.py
+++ b/scripts/imgtool/image.py
@@ -69,6 +69,7 @@
         'ECDSASIG': 0x22,
         'RSA3072': 0x23,
         'ED25519': 0x24,
+        'SIG_PURE': 0x25,
         'ENCRSA2048': 0x30,
         'ENCKW': 0x31,
         'ENCEC256': 0x32,