diff --git a/buffet/commands/command_definition.cc b/buffet/commands/command_definition.cc
new file mode 100644
index 0000000..f24b22d
--- /dev/null
+++ b/buffet/commands/command_definition.cc
@@ -0,0 +1,15 @@
+// Copyright 2014 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "buffet/commands/command_definition.h"
+
+namespace buffet {
+
+CommandDefinition::CommandDefinition(
+    const std::string& category,
+    const std::shared_ptr<const ObjectSchema>& parameters)
+        : category_(category), parameters_(parameters) {
+}
+
+}  // namespace buffet