README.rdoc in fluent-plugin-s3-0.5.11 vs README.rdoc in fluent-plugin-s3-0.6.0.pre1

- old
+ new

@@ -91,9 +91,12 @@
 
 - gzip (default)
 - json
 - text
 - lzo (Need lzop command)
+- lzma2 (Need xz command)
+- gzip_command (Need gzip command)
+  - This compressor uses an external gzip command, hence would result in utilizing CPU cores well compared with `gzip`
 
 See 'Use your compression algorithm' section for adding another format.
 
 [format] Change one line format in the S3 object. Supported formats are "out_file", "json", "ltsv" and "single_value".
 