diff --git a/src/ast/scopes.cc b/src/ast/scopes.cc
index 61fafb1ba1..e7b785546e 100644
--- a/src/ast/scopes.cc
+++ b/src/ast/scopes.cc
@@ -1451,8 +1451,7 @@ void Scope::Print(int n) {
 }
 
 void Scope::CheckScopePositions() {
-  // A scope is allowed to have invalid positions if it is hidden and has no
-  // inner scopes
+  // Visible leaf scopes must have real positions.
   if (!is_hidden() && inner_scope_ == nullptr) {
     CHECK_NE(kNoSourcePosition, start_position());
     CHECK_NE(kNoSourcePosition, end_position());
diff --git a/src/isolate.h b/src/isolate.h
index 9fdff50549..34b0f91f05 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -724,7 +724,7 @@ class Isolate {
   void ReportFailedAccessCheck(Handle<JSObject> receiver);
 
   // Exception throwing support. The caller should use the result
-  // of Throw() as its return vaue.
+  // of Throw() as its return value.
   Object* Throw(Object* exception, MessageLocation* location = NULL);
   Object* ThrowIllegalOperation();