mysqld.cc:

  Fix help message

sql/mysqld.cc

@@ -5770,7 +5770,7 @@ The minimum value for this variable is 4096.",
    (gptr*) &max_system_variables.myisam_sort_buff_size, 0,
    GET_ULONG, REQUIRED_ARG, 8192*1024, 4, ~0L, 0, 1, 0},
   {"myisam_use_mmap", OPT_MYISAM_USE_MMAP,
-   "Use memory mapping for read/write MyISAM tables",
+   "Use memory mapping for reading and writing MyISAM tables",
    (gptr*) &opt_myisam_use_mmap,
    (gptr*) &opt_myisam_use_mmap, 0, GET_BOOL, NO_ARG, 0, 
     0, 0, 0, 0, 0},