--- tsk/img/tsk_img.h.orig	2014-02-02 09:56:12.947709027 +0100
+++ tsk/img/tsk_img.h	2014-02-02 09:55:34.569701897 +0100
@@ -66,6 +66,8 @@
 
         TSK_IMG_TYPE_EWF_EWF = 0x0040,  ///< EWF version
 
+        TSK_IMG_TYPE_EXTERNAL = 0x1000,  ///< external defined format which at least implements TSK_IMG_INFO, used by pytsk
+
         TSK_IMG_TYPE_UNSUPP = 0xffff,   ///< Unsupported disk image type
     } TSK_IMG_TYPE_ENUM;