diff --git a/doc/03-cli.md b/doc/03-cli.md
index 2933a2168..c35eabb61 100644
--- a/doc/03-cli.md
+++ b/doc/03-cli.md
@@ -865,6 +865,8 @@ performance.
   Implicitly enables `--apcu`.
 * **--no-dev:** Disables autoload-dev rules. Composer will by default infer this
   automatically according to the last `install` or `update` `--no-dev` state.
+* **--dev:** Enables autoload-dev rules. Composer will by default infer this
+  automatically according to the last `install` or `update` `--no-dev` state.
 * **--ignore-platform-reqs:** ignore all `php`, `hhvm`, `lib-*` and `ext-*`
   requirements and skip the [platform check](07-runtime.md#platform-check) for these.
   See also the [`platform`](06-config.md#platform) config option.
diff --git a/src/Composer/Command/DumpAutoloadCommand.php b/src/Composer/Command/DumpAutoloadCommand.php
index e6fe3d7e5..7a5fcd5c7 100644
--- a/src/Composer/Command/DumpAutoloadCommand.php
+++ b/src/Composer/Command/DumpAutoloadCommand.php
@@ -35,6 +35,7 @@ class DumpAutoloadCommand extends BaseCommand
                 new InputOption('classmap-authoritative', 'a', InputOption::VALUE_NONE, 'Autoload classes from the classmap only. Implicitly enables `--optimize`.'),
                 new InputOption('apcu', null, InputOption::VALUE_NONE, 'Use APCu to cache found/not-found classes.'),
                 new InputOption('apcu-prefix', null, InputOption::VALUE_REQUIRED, 'Use a custom prefix for the APCu autoloader cache. Implicitly enables --apcu'),
+                new InputOption('dev', null, InputOption::VALUE_NONE, 'Enables autoload-dev rules. Composer will by default infer this automatically according to the last install or update --no-dev state.'),
                 new InputOption('no-dev', null, InputOption::VALUE_NONE, 'Disables autoload-dev rules. Composer will by default infer this automatically according to the last install or update --no-dev state.'),
                 new InputOption('ignore-platform-req', null, InputOption::VALUE_REQUIRED | InputOption::VALUE_IS_ARRAY, 'Ignore a specific platform requirement (php & ext- packages).'),
                 new InputOption('ignore-platform-reqs', null, InputOption::VALUE_NONE, 'Ignore all platform requirements (php & ext- packages).'),
@@ -81,6 +82,12 @@ EOT
         if ($input->getOption('no-dev')) {
             $generator->setDevMode(false);
         }
+        if ($input->getOption('dev')) {
+            if ($input->getOption('no-dev')) {
+                throw new \InvalidArgumentException('You can not use both --no-dev and --dev as they conflict with each other.');
+            }
+            $generator->setDevMode(true);
+        }
         $generator->setClassMapAuthoritative($authoritative);
         $generator->setApcu($apcu, $apcuPrefix);
         $generator->setIgnorePlatformRequirements($ignorePlatformReqs);