README.md in benchmark_driver-0.10.12 vs README.md in benchmark_driver-0.10.13

@@ -1,32 +1,26 @@
 # BenchmarkDriver [![Build Status](https://travis-ci.org/k0kubun/benchmark_driver.svg?branch=master)](https://travis-ci.org/k0kubun/benchmark_driver)
 
 Fully-featured accurate benchmark driver for Ruby
 
-## Project Status
-
-Beta.
-
-Interface might be changed in the future, but it's almost fixed and many features can run well.
-
 ## Features
 ### Accurate Measurement
 
 - Low overhead benchmark by running generated script instead of calling Proc
-- Profiling memory, high-precision real time, user time and system time
+- Profiling memory and high-precision real time
 - Running multiple times to minimize measurement errors
 
 ### Pluggable & Fully Featured
 
-- Flexible and real-time output format in ips, execution time, markdown table, etc.
-- Benchmark with various running options
+- Flexible and real-time output format in comparison, markdown table, graph, etc.
+- Measuring various metrics by specifying runners
 - Integrated benchmark support using external libraries
 - Runner and output format are all pluggable
 
 ### Flexible Interface
 
-- Ruby interface similar to benchmark stdlib, benchmark-ips
+- Ruby interface similar to stdlib benchmark.rb, benchmark-ips
 - YAML input to easily manage structured benchmark set
 - Comparing multiple Ruby binaries, even with miniruby
 
 ## Installation
 
@@ -147,9 +141,30 @@
                2.4.1:   2660777.4 i/s - 1.08x  slower
 
                        str-interp
                2.5.0:   3258489.7 i/s
                2.4.1:   1889805.6 i/s - 1.72x  slower
+```
+
+## Output options
+
+By default, there are following output options.
+
+* compare: benchmark-ips's `compare!`-like output (default)
+* simple: ruby's original `benchmark/driver.rb`-like simple output
+* markdown: output in markdown table
+* record: serialize results in `benchmark_driver.record.yml`, to change outputs later as you like
+
+With `benchmark-driver` CLI, you can specify it with `-o [output]` or `--output [output]`.
+
+With Ruby interface, you can specify it like:
+
+```rb
+Benchmark.driver do |x|
+  x.prelude %{ array = [] }
+  x.report 'Array#empty?', %{ array.empty? }
+  x.output 'markdown'
+end
 ```
 
 ## Contributing
 
 Bug reports and pull requests are welcome on GitHub at https://github.com/k0kubun/benchmark_driver.