"\t\ttag:<tag> (or is:<tag>)\n"
"\t\tid:<message-id>\n"
"\t\tthread:<thread-id>\n"
+ "\t\tfolder:<directory-path>\n"
"\n"
"\tThe from: prefix is used to match the name or address of\n"
"\tthe sender of an email message.\n"
"\tmessages). These thread ID values can be seen in the first\n"
"\tcolumn of output from \"notmuch search\".\n"
"\n"
+ "\tThe folder: prefix can be used to search for email message\n"
+ "\tfiles that are contained within particular directories within\n"
+ "\tthe mail store. Only the directory components below the top-level\n"
+ "\tmail database path are available to be searched.\n"
+ "\n"
"\tIn addition to individual terms, multiple terms can be\n"
"\tcombined with Boolean operators (\"and\", \"or\", \"not\", etc.).\n"
"\tEach term in the query will be implicitly connected by a\n"