| Index: sdk/lib/io/common.dart
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| diff --git a/sdk/lib/io/common.dart b/sdk/lib/io/common.dart
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| index 022e84b340825f3a47f8890eab9fd6c6d43faff3..3fcee6277a14eb8dbae0a34b5d0a18eddb5c74dc 100644
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| --- a/sdk/lib/io/common.dart
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| +++ b/sdk/lib/io/common.dart
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| @@ -5,6 +5,7 @@
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|  part of dart.io;
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|  
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|  // Constants used when working with native ports.
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| +// These must match the constants in runtime/bin/dartutils.h class CObject.
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|  const int _SUCCESS_RESPONSE = 0;
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|  const int _ILLEGAL_ARGUMENT_RESPONSE = 1;
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|  const int _OSERROR_RESPONSE = 2;
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| 
 |