diff --git a/sdk/lib/developer/developer.dart b/sdk/lib/developer/developer.dart
index 6c3fa826c499..c446fdf153e8 100644
--- a/sdk/lib/developer/developer.dart
+++ b/sdk/lib/developer/developer.dart
@@ -30,7 +30,7 @@ part 'timeline.dart';
 /// Returns the value of [when]. Some debuggers may display [message].
 ///
 /// NOTE: When invoked, the isolate will not return until a debugger
-/// continues execution. When running in the Dart VM the behaviour is the same
+/// continues execution. When running in the Dart VM, the behaviour is the same
 /// regardless of whether or not a debugger is connected. When compiled to
 /// JavaScript, this uses the "debugger" statement, and behaves exactly as
 /// that does.
diff --git a/sdk/lib/isolate/isolate.dart b/sdk/lib/isolate/isolate.dart
index 6e43fb7635e9..6a737fea2384 100644
--- a/sdk/lib/isolate/isolate.dart
+++ b/sdk/lib/isolate/isolate.dart
@@ -40,7 +40,7 @@ class IsolateSpawnException implements Exception {
  *
  * An `Isolate` object is a reference to an isolate, usually different from
  * the current isolate.
- * It represents, and can be used control, the other isolate.
+ * It represents, and can be used to control, the other isolate.
  *
  * When spawning a new isolate, the spawning isolate receives an `Isolate`
  * object representing the new isolate when the spawn operation succeeds.