mysqld.cc:

  Describe innodb_max_purge_lag
  Improve description of innodb_table_locks

sql/mysqld.cc

@@ -3702,12 +3702,12 @@ struct my_option my_long_options[] =
    "Percentage of dirty pages allowed in bufferpool", (gptr*) &srv_max_buf_pool_modified_pct,
    (gptr*) &srv_max_buf_pool_modified_pct, 0, GET_ULONG, REQUIRED_ARG, 90, 0, 100, 0, 0, 0},
   {"innodb_max_purge_lag", OPT_INNODB_MAX_PURGE_LAG,
-   "",
+   "Desired maximum length of the purge queue (0 = no limit)",
    (gptr*) &srv_max_purge_lag,
    (gptr*) &srv_max_purge_lag, 0, GET_LONG, REQUIRED_ARG, 0, 0, ~0L,
    0, 1L, 0},
   {"innodb_table_locks", OPT_INNODB_TABLE_LOCKS,
-   "If Innodb should enforce LOCK TABLE",
+   "Enable InnoDB locking in LOCK TABLES",
    (gptr*) &global_system_variables.innodb_table_locks,
    (gptr*) &global_system_variables.innodb_table_locks,
    0, GET_BOOL, OPT_ARG, 1, 0, 0, 0, 0, 0},