diff --git a/runtime/bin/process_patch.dart b/runtime/bin/process_patch.dart
index ff99345..4cdc853 100644
--- a/runtime/bin/process_patch.dart
+++ b/runtime/bin/process_patch.dart
@@ -158,7 +158,10 @@
         _err.close();
         _exitHandler.close();
         completer.completeException(
-            new ProcessException(status._errorMessage, status._errorCode));
+            new ProcessException(_path,
+                                 _arguments,
+                                 status._errorMessage,
+                                 status._errorCode));
         return;
       }
       _started = true;
@@ -245,7 +248,7 @@
 
   void set onExit(void callback(int exitCode)) {
     if (_ended) {
-      throw new ProcessException("Process killed");
+      throw new ProcessException(_path, _arguments, "Process killed");
     }
     _onExit = callback;
   }
diff --git a/sdk/lib/io/process.dart b/sdk/lib/io/process.dart
index 8d6d9f2..f2062df 100644
--- a/sdk/lib/io/process.dart
+++ b/sdk/lib/io/process.dart
@@ -214,8 +214,25 @@
 
 
 class ProcessException implements Exception {
-  const ProcessException([String this.message = "", int this.errorCode = 0]);
-  String toString() => "ProcessException: $message ($errorCode)";
+  const ProcessException(String this.executable,
+                         List<String> this.arguments,
+                         [String this.message = "",
+                          int this.errorCode = 0]);
+  String toString() {
+    var msg = (message == null) ? 'OS error code: $errorCode' : message;
+    var args = Strings.join(arguments, ' ');
+    return "ProcessException: $msg\n  Command: $executable $args";
+  }
+
+  /**
+   * Contains the executable provided for the process.
+   */
+  final String executable;
+
+  /**
+   * Contains the arguments provided for the process.
+   */
+  final List<String> arguments;
 
   /**
    * Contains the system message for the process exception if any.