Update src/README.md

src/README.md

@@ -2,30 +2,45 @@ fzf in Go
 =========
 
 This directory contains the source code for the new fzf implementation in
-[Go][go]. The new version has the following benefits over the previous Ruby
-version.
+[Go][go].
 
-Motivation
-----------
+Upgrade from Ruby version
+-------------------------
+
+The install script has been updated to download the right binary for your
+system. If you already have installed fzf, simply git-pull the repository and
+rerun the install script.
+
+```sh
+cd ~/.fzf
+git pull
+./install
+```
+
+Motivations
+-----------
 
 ### No Ruby dependency
 
 There have always been complaints about fzf being a Ruby script. To make
-matters worse, Ruby 2.1 dropped ncurses support from its standard libary.
-Because of the change, users running Ruby 2.1 or above were forced to build C
+matters worse, Ruby 2.1 removed ncurses binding from its standard libary.
+Because of the change, users running Ruby 2.1 or above are forced to build C
 extensions of curses gem to meet the requirement of fzf. The new Go version
 will be distributed as an executable binary so it will be much more accessible
-and easier to setup.
+and should be easier to setup.
 
 ### Performance
 
-With the presence of [GIL][gil], Ruby cannot utilize multiple CPU cores. Even
-though the Ruby version of fzf was pretty responsive even for 100k+ lines,
-which is well above the size of the usual input, it was obvious that we could
-do better. Now with the Go version, GIL is gone, and the search performance
-scales proportional to the number of cores. On my Macbook Pro (Mid 2012), it
-was shown to be an order of magnitude faster on certain cases. It also starts
-much faster than before though the difference shouldn't be really noticeable.
+Many people have been surprised to see how fast fzf is even when it was
+written in Ruby. It stays quite responsive even for 100k+ lines, which is
+well above the size of the usual input.
+
+The new Go version, of course, is significantly faster than that. It has all
+the performance optimization techniques used in Ruby implementation and more.
+It also doesn't suffer from [GIL][gil], so the search performance scales
+proportional to the number of CPU cores. On my MacBook Pro (Mid 2012), the new
+version was shown to be an order of magnitude faster on certain cases. It also
+starts much faster though the difference may not be noticeable.
 
 Differences with Ruby version
 -----------------------------
@@ -40,19 +55,19 @@ even for 1M+ items) so I decided that it's no longer required.
 System requirements
 -------------------
 
-Currently prebuilt binaries are provided only for OS X and Linux. The install
+Currently, prebuilt binaries are provided only for OS X and Linux. The install
 script will fall back to the legacy Ruby version on the other systems, but if
 you have Go 1.4 installed, you can try building it yourself.
 
 However, as pointed out in [golang.org/doc/install][req], the Go version may
-not run on CentOS/RHEL 5.x and thus the install script will choose the Ruby
-version instead.
+not run on CentOS/RHEL 5.x, and if that's the case, the install script will
+choose the Ruby version instead.
 
 The Go version depends on [ncurses][ncurses] and some Unix system calls, so it
-shouldn't run natively on Windows at the moment. But it should be not
-impossible to support Windows by falling back to a cross-platform alternative
-such as [termbox][termbox] only on Windows. If you're interested in making fzf
-work on Windows, please let me know.
+shouldn't run natively on Windows at the moment. But it won't be impossible to
+support Windows by falling back to a cross-platform alternative such as
+[termbox][termbox] only on Windows. If you're interested in making fzf work on
+Windows, please let me know.
 
 Build
 -----
@@ -68,6 +83,17 @@ make install
 make linux
 ```
 
+Contribution
+------------
+
+For the time being, I will not add or accept any new features until we can be
+sure that the implementation is stable and we have a sufficient number of test
+cases. However, fixes for obvious bugs and new test cases are welcome.
+
+I also care much about the performance of the implementation, so please make
+sure that your change does not result in performance regression. And please be
+noted that we don't have a quantitative measure of the performance yet.
+
 Third-party libraries used
 --------------------------
 
@@ -77,18 +103,6 @@ Third-party libraries used
 - [mattn/go-shellwords](https://github.com/mattn/go-shellwords)
     - Licensed under [MIT](http://mattn.mit-license.org/2014)
 
-Contribution
-------------
-
-For the time being, I will not add or accept any new features until we can be
-sure that the implementation is stable and we have a sufficient number of test
-cases. However, fixes for obvious bugs and new test cases are welcome.
-
-I also care much about the performance of the implementation (that's the
-reason I rewrote the whole thing in Go, right?), so please make sure that your
-change does not result in performance regression. Please be minded that we
-still don't have a quantitative measure of the performance.
-
 License
 -------