diff --git a/engine/src/flutter/CONTRIBUTING.md b/engine/src/flutter/CONTRIBUTING.md
index d2c2c5061e6..f1fcd4d938a 100644
--- a/engine/src/flutter/CONTRIBUTING.md
+++ b/engine/src/flutter/CONTRIBUTING.md
@@ -20,7 +20,7 @@ Getting the code
 
 To get the code:
 
- * Fork `https://github.com/flutter/engine` into your own GitHub account.
+ * Fork `https://github.com/flutter/engine` into your own GitHub account. If you already have a fork, and are now installing a development environment on a new machine, make sure you've updated your fork so that you don't use stale configuration options from long ago.
  * If you haven't configured your machine with an SSH key that's shared by github then
    follow the directions here: https://help.github.com/articles/generating-ssh-keys/.
  * Create an empty directory for your copy of the repository. Call it what you like. For