diff --git a/README.md b/README.md
index 357bbb195d8..46e5014e36e 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,8 @@
 The Servo Parallel Browser Project
 
-Servo is a prototype web browser engine written in the [Rust](https://github.com/mozilla/rust)
-language. It is currently developed on 64bit OS X and 64bit Linux.
+Servo is a prototype web browser engine written in the
+[Rust](https://github.com/mozilla/rust) language. It is currently developed on
+64bit OS X, 64bit Linux, and Android.
 
 Servo welcomes contribution from everyone.  See
 [`CONTRIBUTING.md`](CONTRIBUTING.md) for help getting started.
@@ -11,30 +12,29 @@ Servo welcomes contribution from everyone.  See
 On OS X (homebrew):
 
 ``` sh
-brew install https://raw.github.com/Homebrew/homebrew-versions/master/autoconf213.rb
-brew install automake libtool pkg-config python
+brew install automake pkg-config python
 pip install virtualenv
 ```
 
 On OS X (MacPorts):
 
 ``` sh
-sudo port install autoconf213 python27 py27-virtualenv
+sudo port install python27 py27-virtualenv
 ```
 
 On Debian-based Linuxes:
 
 ``` sh
-sudo apt-get install autoconf2.13 curl freeglut3-dev libtool \
+sudo apt-get install curl freeglut3-dev \
     libfreetype6-dev libgl1-mesa-dri libglib2.0-dev xorg-dev \
-    msttcorefonts gperf g++ automake cmake python-virtualenv \
+    msttcorefonts gperf g++ cmake python-virtualenv \
     libssl-dev
 ```
 
 On Fedora:
 
 ``` sh
-sudo yum install autoconf213 curl freeglut-devel libtool gcc-c++ libXi-devel \
+sudo yum install curl freeglut-devel libtool gcc-c++ libXi-devel \
     freetype-devel mesa-libGL-devel glib2-devel libX11-devel libXrandr-devel gperf \
     fontconfig-devel cabextract ttmkfdir python python-virtualenv expat-devel \
     rpm-build openssl-devel
@@ -49,33 +49,31 @@ popd
 On Arch Linux:
 
 ``` sh
-sudo pacman -S base-devel autoconf2.13 git gperf python2 \
+sudo pacman -S base-devel git gperf python2 \
     python2-virtualenv mesa libxrandr libxi libgl glu ttf-font
 ```
 
-Note: autoconf 2.13 is required for SpiderMonkey; the autoconf project did not
-preserve backwards compatibility after version 2.13, and changing the Firefox
-build to work with a newer version is not considered a good use of developers'
-time.
-
 Cross-compilation for Android:
 
-Basically, pre-installed Android tools are needed.
-See wiki for [details](https://github.com/mozilla/servo/wiki/Building-for-Android)
+Pre-installed Android tools are needed. See wiki for
+[details](https://github.com/mozilla/servo/wiki/Building-for-Android)
 
 ## The Rust compiler
 
-Servo builds its own copy of Rust, so there is no need to provide a Rust
-compiler.
-If you'd like to know the snapshot revision of Rust which we use, see `./rust-snapshot-hash`.
+Servo uses a snapshot Rust compiler to build itself. This is normally a
+specific revision of Rust upstream, but sometimes has a backported patch or
+two. If you'd like to know the snapshot revision of Rust which we use, see
+`./rust-snapshot-hash`.
 
 ## Building
 
-Servo cannot be built in-tree; you must create a directory in which to run
-configure and make and place the build artifacts.
+Servo is built with Cargo, the Rust package manager. We also use Mozilla's
+Mach tools to orchestrate the build and other tasks.
+
+### Normal build
 
 ``` sh
-git clone https://github.com/servo/servo.git
+git clone https://github.com/servo/servo
 cd servo
 ./mach build
 ./mach run tests/html/about-mozilla.html
@@ -84,7 +82,7 @@ cd servo
 ### Building for Android target
 
 ``` sh
-git clone https://github.com/servo/servo.git
+git clone https://github.com/servo/servo
 cd servo
 ANDROID_TOOLCHAIN=/path/to/toolchain ANDROID_NDK=/path/to/ndk PATH=$PATH:/path/to/toolchain/bin ./mach build --target arm-linux-androideabi
 cd ports/android
@@ -112,4 +110,5 @@ ANDROID_SDK=/path/to/sdk make install
 
 ## Developing
 
-There are lots of mach commands you can use. You can list them with `./mach --help`.
+There are lots of mach commands you can use. You can list them with `./mach
+--help`.