diff -u b/core/scripts/run-tests.sh b/core/scripts/run-tests.sh
--- b/core/scripts/run-tests.sh
+++ b/core/scripts/run-tests.sh
@@ -211,7 +211,8 @@
   --types
 
               Runs just tests from the specified test type, for example
-              run-tests.sh --types=SimpleTest,PHPUnit-Functional
+              run-tests.sh
+              (i.e. --types "Simpletest,PHPUnit-Functional")
 
   --directory Run all tests found within the specified file directory.