Append, rather than prepend to PROMPT_COMMAND

README

@@ -71,7 +71,7 @@ NOTES
 
    Frecency:
        Frecency is a portmanteau of 'recent' and 'frequency'. It is a weighted
-       rank  that  depends on how often and how recently something occurred. As
+       rank  that depends on how often and how recently something occurred. As
        far as I know, Mozilla came up with the term.
 
        To z, a directory that has low ranking but has been  accessed  recently
@@ -109,9 +109,9 @@ ENVIRONMENT
        resolving  of  symlinks.  If  it  is  not  set,  symbolic links will be
        resolved when added to the datafile.
 
-       In bash, z prepends a command to the PROMPT_COMMAND  environment  vari-
-       able  to  maintain its database. In zsh, z appends a function _z_precmd
-       to the precmd_functions array.
+       In bash, z appends a command to the PROMPT_COMMAND environment variable
+       to maintain its database. In zsh, z appends a function _z_precmd to the
+       precmd_functions array.
 
        The environment variable $_Z_NO_PROMPT_COMMAND can be set if  you  want
        to handle PROMPT_COMMAND or precmd yourself.