diff --git a/src/smblib/smbdefs.h b/src/smblib/smbdefs.h
index 38aa52989b428e62545ac9b8a600a89841afd728..721a03b13e4e3bd747ea5768fb0c20c4035cee03 100644
--- a/src/smblib/smbdefs.h
+++ b/src/smblib/smbdefs.h
@@ -233,6 +233,7 @@
 #define SMB_PRIORITY		0x66
 #define SMB_COST			0x67
 #define	SMB_EDITOR			0x68
+#define SMB_TAGS			0x69	/* List of tags (ala hashtags) related to this message */
 
 #define FILEATTACH			0x70
 #define DESTFILE			0x71