my %keywords = (
       chomp     => '(STRING)',
       substr    => '(EXPR, OFFSET, LENGTH, REPLACEMENT)',
       index     => '(STR, SUBSTR, INDEX)',
       pop       => '(@ARRAY)',
       psush     => '(@ARRAY, LIST)',
       print     => '(LIST) or (FILEHANDLE LIST)',
       join      => '(EXPR, LIST)',
       split     => '(/PATTERN/,EXPR,LIMIT)',
       wantarray => '()',
    );