Update CONTRIBUTING.md
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 450ed8d..6681472 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -21,7 +21,7 @@
To get the code:
* 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
+ * If you haven't configured your machine with an SSH key that's known to 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
the sake of the instructions that follow, we'll call it `flutter`.
