diff --git a/engine/src/flutter/testing/run_tests.py b/engine/src/flutter/testing/run_tests.py
index edac4df1f73..b84e6efcd6a 100755
--- a/engine/src/flutter/testing/run_tests.py
+++ b/engine/src/flutter/testing/run_tests.py
@@ -538,16 +538,17 @@ def RunClangTidyTests(build_dir):
 
 def main():
   parser = argparse.ArgumentParser()
+  all_types = ['engine', 'dart', 'benchmarks', 'java', 'android', 'objc', 'font-subset']
 
   parser.add_argument('--variant', dest='variant', action='store',
       default='host_debug_unopt', help='The engine build variant to run the tests for.')
-  parser.add_argument('--type', type=str, default='all')
+  parser.add_argument('--type', type=str, default='all', help='A list of test types, default is "all" (equivalent to "%s")' % (','.join(all_types)))
   parser.add_argument('--engine-filter', type=str, default='',
       help='A list of engine test executables to run.')
   parser.add_argument('--dart-filter', type=str, default='',
       help='A list of Dart test scripts to run.')
   parser.add_argument('--java-filter', type=str, default='',
-      help='A single Java test class to run.')
+      help='A single Java test class to run (example: "io.flutter.SmokeTest")')
   parser.add_argument('--android-variant', dest='android_variant', action='store',
       default='android_debug_unopt',
       help='The engine build variant to run java or android tests for')
@@ -565,12 +566,12 @@ def main():
   parser.add_argument('--use-sanitizer-suppressions', dest='sanitizer_suppressions', action='store_true',
       default=False, help='Provide the sanitizer suppressions lists to the via environment to the tests.')
   parser.add_argument('--adb-path', dest='adb_path', action='store',
-      default=None, help='Provide the path of adb used for android tests.  By default it looks on $PATH.')
+      default=None, help='Provide the path of adb used for android tests. By default it looks on $PATH.')
 
   args = parser.parse_args()
 
   if args.type == 'all':
-    types = ['engine', 'dart', 'benchmarks', 'java', 'objc', 'font-subset']
+    types = all_types
   else:
     types = args.type.split(',')