Definition: { *&hf_mongo_msg_flags,* { "Message Flags", "mongo.msg.flags", FT_UINT32, BASE_HEX, NULL, 0x0, "Bit vector of msg options.", HFILL } }, { *&hf_mongo_msg_flags_checksumpresent,* { "ChecksumPresent", "mongo.msg.flags.checksumpresent", FT_BOOLEAN, 32, *TFS(&tfs_yes_no)*, *0x00000001,* "The message ends with 4 bytes containing a CRC-32C [1] checksum", HFILL } }, Add to tree: static const int * mongo_msg_flags[] = { *&hf_mongo_msg_flags_checksumpresent,* &hf_mongo_msg_flags_moretocome, &hf_mongo_msg_flags_exhaustallowed, NULL }; *proto_tree_add_bitmask*( tree, tvb, offset, *hf_mongo_msg_flags,* ett_mongo_msg_flags, *mongo_msg_flags,* ENC_LITTLE_ENDIAN );