diff --git a/README.md b/README.md
index d404341b87..7d5d0c4ff1 100644
--- a/README.md
+++ b/README.md
@@ -89,6 +89,8 @@ We use grunt to automate many tasks. Run `grunt -h` to see a mostly complete lis
 grunt test
 # Build and run tests in your browser
 grunt test --debug
+# For speed, you can use fasttest and add --filter to only run one test
+grunt fasttest --filter=ReactIdentity
 # Lint the code with JSHint
 grunt lint
 # Wipe out build directory