diff --git a/build/docs/index.rst b/build/docs/index.rst
index 0dd663db96af..8a7cb973b782 100644
--- a/build/docs/index.rst
+++ b/build/docs/index.rst
@@ -16,6 +16,7 @@ Important Concepts
    :maxdepth: 1
 
    build-overview
+   supported-configurations
    Mozconfig Files <mozconfigs>
    mozbuild-files
    mozbuild-symbols
diff --git a/build/docs/supported-configurations.rst b/build/docs/supported-configurations.rst
new file mode 100644
index 000000000000..cc2c1ea7282d
--- /dev/null
+++ b/build/docs/supported-configurations.rst
@@ -0,0 +1,55 @@
+.. _build_supported_configurations:
+
+========================
+Supported Configurations
+========================
+
+This page attempts to document supported build configurations.
+
+Windows
+=======
+
+We support building on Windows XP and newer operating systems using
+Visual Studio 2010 and newer.
+
+The following are not fully supported by Mozilla (but may work):
+
+* Building without the latest *MozillaBuild* Windows development
+  environment
+* Building with Mingw or any other non-Visual Studio toolchain.
+
+OS X
+====
+
+We support building on OS X 10.6 and newer with the OS X 10.6 SDK.
+
+The tree should build with the following OS X releases and SDK versions:
+
+* 10.6 Snow Leopard
+* 10.7 Lion
+* 10.8 Mountain Lion
+* 10.9 Mavericks
+
+The tree requires building with Clang 3.3 and newer. This corresponds to
+version of 4.2 of Apple's Clang that ships with Xcode. This corresponds
+to Xcode 4.6 and newer. Xcode 4.6 only runs on OS X 10.7.4 and newer.
+So, OS X 10.6 users will need to install a non-Apple toolchain. Running
+``mach bootstrap`` should install an appropriate toolchain from Homebrew
+or MacPorts automatically.
+
+The tree should build with GCC 4.4 and newer on OS X. However, this
+build configuration isn't as widely used (and differs from what Mozilla
+uses to produce OS X builds), so it's recommended to stick with Clang.
+
+Linux
+=====
+
+Linux 2.6 and later kernels are supported.
+
+Most distributions are supported as long as the proper package
+dependencies are in place. Running ``mach bootstrap`` should install
+packages for popular Linux distributions. ``configure`` will typically
+detect missing dependencies and inform you how to disable features to
+work around unsatisfied dependencies.
+
+Clang 3.3 or GCC 4.4 is required to build the tree.