Updated FileTreeDocumentation (markdown)
diff --git a/FileTreeDocumentation.md b/FileTreeDocumentation.md
index 28de565..9fdd85f 100644
--- a/FileTreeDocumentation.md
+++ b/FileTreeDocumentation.md
@@ -55,32 +55,54 @@
### misc/cgo
+The `misc/cgo` directory contains tests and examples of cgo.
+
### misc/chrome
+The `misc/chrome` directory contains a Chrome extension for Go contributors.
+
### misc/git
+The `misc/git` directory contains a pre-commit hook to ensure that go files have been run through gofmt.
+
### misc/ios
### misc/linkcheck
+The `misc/linkcheck` directory contains a program for ensuring there are no missing links in the godoc website.
+
### misc/nacl
+The `misc/nacl` directory contains Go's integration with nacl, which is used by [the Go playground](https://play.golang.org).
+
### misc/sortac
+The `misc/sortac` directory contains a utility for sorting the `AUTHORS` and `CONTRIBUTORS` files.
+
### misc/swig
+The `misc/swig` directory contains examples of using Go with [SWIG](https://github.com/swig/swig).
+
### misc/tour
+The `misc/tour` directory contains the resources and source code for the [Go tour](https://tour.golang.org).
+
### misc/trace
+The `misc/trace` directory contains a generated file used by `go tool trace`.
+
## pkg
+The `pkg` directory contains platform-specific build artifacts. It will always contain the following:
+
### pkg/include
### pkg/obj
### pkg/tool
+The `pkg/tool` directory contains the platform-specific tool chain exposed by the `go tool` command.
+
## src
The `src` directory contains the source code for the standard library and, in `src/cmd`, tool chain.
