diff --git a/lib/ntlm/heimntlm.h b/lib/ntlm/heimntlm.h
index 03f97d0b8..0fcc832e1 100644
--- a/lib/ntlm/heimntlm.h
+++ b/lib/ntlm/heimntlm.h
@@ -58,11 +58,11 @@ struct ntlm_buf {
 #define NTLM_MBZ8			0x00000100
 #define NTLM_NEG_NTLM			0x00000200
 #define NTLM_NEG_NT_ONLY		0x00000400
-#define NTLM_MBZ7			0x00000800
+#define NTLM_MBZ7			0x00000800 /* anon ? */
 
 #define NTLM_OEM_SUPPLIED_DOMAIN	0x00001000
 #define NTLM_OEM_SUPPLIED_WORKSTAION	0x00002000
-#define NTLM_MBZ6			0x00004000
+#define NTLM_MBZ6			0x00004000 /* local call ? */
 #define NTLM_NEG_ALWAYS_SIGN		0x00008000
 
 #define NTLM_TARGET_DOMAIN		0x00010000