Update CONTRIBUTING.md
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index c58b680..488d614 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -12,7 +12,8 @@
* Chromium's [depot_tools](http://www.chromium.org/developers/how-tos/install-depot-tools) (make sure it's in your path). We use the 'gclient' tool from depot_tools.
* Python (used by many of our tools, including 'gclient').
* curl (used by `gclient sync`).
- * [Dart](https://www.dartlang.org/downloads/linux.html).
+
+You do not need [Dart](https://www.dartlang.org/downloads/linux.html) installed, as a Dart tool chain is automatically downloaded as part of the "getting the code" step.
Getting the code
----------------
