diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8c416d6..74a6d1e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 0.13.1
+
+* Add `ArgParser.addSeparator()`. Separators allow users to group their options
+  in the usage text.
+
 ## 0.13.0
 
 * **Breaking change**: An option that allows multiple values will now
diff --git a/example/test_runner.dart b/example/test_runner.dart
index 9480f41..0d15e83 100644
--- a/example/test_runner.dart
+++ b/example/test_runner.dart
@@ -14,11 +14,7 @@
 main() {
   var parser = new ArgParser();
 
-  parser.addOption('mode',
-      abbr: 'm',
-      defaultsTo: 'debug',
-      help: 'Mode in which to run the tests',
-      allowed: ['all', 'debug', 'release']);
+  parser.addSeparator('===== Platform');
 
   parser.addOption('compiler',
       abbr: 'c',
@@ -80,6 +76,14 @@
       help: 'The operating system to run tests on',
       allowed: ['linux', 'macos', 'windows']);
 
+  parser.addSeparator('===== Runtime');
+
+  parser.addOption('mode',
+      abbr: 'm',
+      defaultsTo: 'debug',
+      help: 'Mode in which to run the tests',
+      allowed: ['all', 'debug', 'release']);
+
   parser.addFlag('checked',
       defaultsTo: false, help: 'Run tests in checked mode');
 
@@ -88,6 +92,24 @@
 
   parser.addOption('timeout', abbr: 't', help: 'Timeout in seconds');
 
+  parser.addOption('tasks',
+      abbr: 'j',
+      defaultsTo: Platform.numberOfProcessors.toString(),
+      help: 'The number of parallel tasks to run');
+
+  parser.addOption('shards',
+      defaultsTo: '1',
+      help: 'The number of instances that the tests will be sharded over');
+
+  parser.addOption('shard',
+      defaultsTo: '1',
+      help: 'The index of this instance when running in sharded mode');
+
+  parser.addFlag('valgrind',
+      defaultsTo: false, help: 'Run tests through valgrind');
+
+  parser.addSeparator('===== Output');
+
   parser.addOption('progress',
       abbr: 'p',
       defaultsTo: 'compact',
@@ -106,32 +128,24 @@
       defaultsTo: false,
       help: 'Print a summary report of the number of tests, by expectation');
 
-  parser.addOption('tasks',
-      abbr: 'j',
-      defaultsTo: Platform.numberOfProcessors.toString(),
-      help: 'The number of parallel tasks to run');
-
-  parser.addOption('shards',
-      defaultsTo: '1',
-      help: 'The number of instances that the tests will be sharded over');
-
-  parser.addOption('shard',
-      defaultsTo: '1',
-      help: 'The index of this instance when running in sharded mode');
-
   parser.addFlag('verbose',
       abbr: 'v', defaultsTo: false, help: 'Verbose output');
 
   parser.addFlag('list',
       defaultsTo: false, help: 'List tests only, do not run them');
 
+  parser.addFlag('time',
+      help: 'Print timing information after running tests', defaultsTo: false);
+
+  parser.addFlag('batch',
+      abbr: 'b', help: 'Run browser tests in batch mode', defaultsTo: true);
+
+  parser.addSeparator('===== Miscellaneous');
+
   parser.addFlag('keep-generated-tests',
       defaultsTo: false,
       help: 'Keep the generated files in the temporary directory');
 
-  parser.addFlag('valgrind',
-      defaultsTo: false, help: 'Run tests through valgrind');
-
   parser.addOption('special-command', help: """
 Special command support. Wraps the command line in
 a special command. The special command should contain
@@ -143,15 +157,9 @@
 'python -u valgrind.py @ suffix' the final command will be
 'python -u valgrind.py dart file.dart suffix'""");
 
-  parser.addFlag('time',
-      help: 'Print timing information after running tests', defaultsTo: false);
-
   parser.addOption('dart', help: 'Path to dart executable');
   parser.addOption('drt', help: 'Path to content shell executable');
   parser.addOption('dartium', help: 'Path to Dartium Chrome executable');
 
-  parser.addFlag('batch',
-      abbr: 'b', help: 'Run browser tests in batch mode', defaultsTo: true);
-
   print(parser.usage);
 }
diff --git a/lib/src/arg_parser.dart b/lib/src/arg_parser.dart
index 49d6aa6..c32741d 100644
--- a/lib/src/arg_parser.dart
+++ b/lib/src/arg_parser.dart
@@ -23,6 +23,10 @@
   /// The commands that have been defined for this parser.
   final Map<String, ArgParser> commands;
 
+  /// A list of the [Option]s in [options] intermingled with [String]
+  /// separators.
+  final _optionsAndSeparators = [];
+
   /// Whether or not this parser parses options that appear after non-option
   /// arguments.
   final bool allowTrailingOptions;
@@ -110,9 +114,19 @@
       }
     }
 
-    _options[name] = newOption(name, abbr, help, valueHelp, allowed,
+    var option = newOption(name, abbr, help, valueHelp, allowed,
         allowedHelp, defaultsTo, callback, type,
         negatable: negatable, splitCommas: splitCommas, hide: hide);
+    _options[name] = option;
+    _optionsAndSeparators.add(option);
+  }
+
+  /// Adds a separator line to the usage.
+  ///
+  /// In the usage text for the parser, this will appear between any options
+  /// added before this call and ones added after it.
+  void addSeparator(String text) {
+    _optionsAndSeparators.add(text);
   }
 
   /// Parses [args], a list of command-line arguments, matches them against the
@@ -124,12 +138,12 @@
   ///
   /// This is basically the help text shown on the command line.
   @Deprecated("Replaced with get usage. getUsage() will be removed in args 1.0")
-  String getUsage() => new Usage(this).generate();
+  String getUsage() => usage;
 
   /// Generates a string displaying usage information for the defined options.
   ///
   /// This is basically the help text shown on the command line.
-  String get usage => new Usage(this).generate();
+  String get usage => new Usage(_optionsAndSeparators).generate();
 
   /// Get the default value for an option. Useful after parsing to test if the
   /// user specified something other than the default.
diff --git a/lib/src/usage.dart b/lib/src/usage.dart
index 11be54b..177a810 100644
--- a/lib/src/usage.dart
+++ b/lib/src/usage.dart
@@ -22,8 +22,8 @@
 class Usage {
   static const NUM_COLUMNS = 3; // Abbreviation, long name, help.
 
-  /// The parser this is generating usage for.
-  final ArgParser args;
+  /// A list of the [Option]s intermingled with [String] separators.
+  final List optionsAndSeparators;
 
   /// The working buffer for the generated usage text.
   StringBuffer buffer;
@@ -53,7 +53,7 @@
   /// content.
   int newlinesNeeded = 0;
 
-  Usage(this.args);
+  Usage(this.optionsAndSeparators);
 
   /// Generates a string displaying usage information for the defined options.
   /// This is basically the help text shown on the command line.
@@ -62,8 +62,17 @@
 
     calculateColumnWidths();
 
-    args.options.forEach((name, option) {
-      if (option.hide) return;
+    for (var optionOrSeparator in optionsAndSeparators) {
+      if (optionOrSeparator is String) {
+        // Ensure that there's always a blank line before a separator.
+        if (buffer.isNotEmpty) buffer.write("\n\n");
+        buffer.write(optionOrSeparator);
+        newlinesNeeded = 1;
+        continue;
+      }
+
+      var option = optionOrSeparator as Option;
+      if (option.hide) continue;
 
       write(0, getAbbreviation(option));
       write(1, getLongOption(option));
@@ -94,7 +103,7 @@
       // blank line after it. This gives space where it's useful while still
       // keeping simple one-line options clumped together.
       if (numHelpLines > 1) newline();
-    });
+    }
 
     return buffer.toString();
   }
@@ -127,8 +136,9 @@
   void calculateColumnWidths() {
     int abbr = 0;
     int title = 0;
-    args.options.forEach((name, option) {
-      if (option.hide) return;
+    for (var option in optionsAndSeparators) {
+      if (option is! Option) continue;
+      if (option.hide) continue;
 
       // Make room in the first column if there are abbreviations.
       abbr = max(abbr, getAbbreviation(option).length);
@@ -142,7 +152,7 @@
           title = max(title, getAllowedTitle(allowed).length);
         }
       }
-    });
+    }
 
     // Leave a gutter between the columns.
     title += 4;
diff --git a/pubspec.yaml b/pubspec.yaml
index cb373be..3b71ea3 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: args
-version: 0.13.1-dev
+version: 0.13.1
 author: "Dart Team <misc@dartlang.org>"
 homepage: https://github.com/dart-lang/args
 description: >
diff --git a/test/usage_test.dart b/test/usage_test.dart
index 51efc05..492c517 100644
--- a/test/usage_test.dart
+++ b/test/usage_test.dart
@@ -205,6 +205,77 @@
           --[no-]third    The third flag
           ''');
     });
+
+    group("separators", () {
+      test("separates options where it's placed", () {
+        var parser = new ArgParser();
+        parser.addFlag('zebra', help: 'First');
+        parser.addSeparator('Primate:');
+        parser.addFlag('monkey', help: 'Second');
+        parser.addSeparator('Marsupial:');
+        parser.addFlag('wombat', help: 'Third');
+
+        validateUsage(parser, '''
+            --[no-]zebra     First
+
+            Primate:
+            --[no-]monkey    Second
+
+            Marsupial:
+            --[no-]wombat    Third
+            ''');
+      });
+
+      test("doesn't add extra newlines after a multiline option", () {
+        var parser = new ArgParser();
+        parser.addFlag('zebra', help: 'Multi\nline');
+        parser.addSeparator('Primate:');
+        parser.addFlag('monkey', help: 'Second');
+
+        validateUsage(parser, '''
+            --[no-]zebra     Multi
+                             line
+
+            Primate:
+            --[no-]monkey    Second
+            ''');
+      });
+
+      test("doesn't add newlines if it's the first component", () {
+        var parser = new ArgParser();
+        parser.addSeparator('Equine:');
+        parser.addFlag('zebra', help: 'First');
+
+        validateUsage(parser, '''
+            Equine:
+            --[no-]zebra    First
+            ''');
+      });
+
+      test("doesn't add trailing newlines if it's the last component", () {
+        var parser = new ArgParser();
+        parser.addFlag('zebra', help: 'First');
+        parser.addSeparator('Primate:');
+
+        validateUsage(parser, '''
+            --[no-]zebra    First
+
+            Primate:
+            ''');
+      });
+
+      test("adds a newline after another separator", () {
+        var parser = new ArgParser();
+        parser.addSeparator('First');
+        parser.addSeparator('Second');
+
+        validateUsage(parser, '''
+            First
+
+            Second
+            ''');
+      });
+    });
   });
 }