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diff --git a/src/main/java/com/google/devtools/common/options/OptionPriority.java b/src/main/java/com/google/devtools/common/options/OptionPriority.java
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+++ b/src/main/java/com/google/devtools/common/options/OptionPriority.java
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+// Copyright 2014 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package com.google.devtools.common.options;
+
+/**
+ * The priority of option values, in order of increasing priority.
+ *
+ * <p>In general, new values for options can only override values with a lower or
+ * equal priority. Option values provided in annotations in an options class are
+ * implicitly at the priority {@code DEFAULT}.
+ *
+ * <p>The ordering of the priorities is the source-code order. This is consistent
+ * with the automatically generated {@code compareTo} method as specified by the
+ * Java Language Specification. DO NOT change the source-code order of these
+ * values, or you will break code that relies on the ordering.
+ */
+public enum OptionPriority {
+
+  /**
+   * The priority of values specified in the {@link Option} annotation. This
+   * should never be specified in calls to {@link OptionsParser#parse}.
+   */
+  DEFAULT,
+
+  /**
+   * Overrides default options at runtime, while still allowing the values to be
+   * overridden manually.
+   */
+  COMPUTED_DEFAULT,
+
+  /**
+   * For options coming from a configuration file or rc file.
+   */
+  RC_FILE,
+
+  /**
+   * For options coming from the command line.
+   */
+  COMMAND_LINE,
+
+  /**
+   * This priority can be used to unconditionally override any user-provided options.
+   * This should be used rarely and with caution!
+   */
+  SOFTWARE_REQUIREMENT;
+
+}