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diff --git a/vendor/psy/psysh/src/Psy/Command/HelpCommand.php b/vendor/psy/psysh/src/Psy/Command/HelpCommand.php
new file mode 100644
index 000000000..fd32ddefa
--- /dev/null
+++ b/vendor/psy/psysh/src/Psy/Command/HelpCommand.php
@@ -0,0 +1,98 @@
+<?php
+
+/*
+ * This file is part of Psy Shell.
+ *
+ * (c) 2012-2017 Justin Hileman
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Psy\Command;
+
+use Symfony\Component\Console\Helper\TableHelper;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Help command.
+ *
+ * Lists available commands, and gives command-specific help when asked nicely.
+ */
+class HelpCommand extends Command
+{
+    private $command;
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('help')
+            ->setAliases(array('?'))
+            ->setDefinition(array(
+                new InputArgument('command_name', InputArgument::OPTIONAL, 'The command name', null),
+            ))
+            ->setDescription('Show a list of commands. Type `help [foo]` for information about [foo].')
+            ->setHelp('My. How meta.');
+    }
+
+    /**
+     * Helper for setting a subcommand to retrieve help for.
+     *
+     * @param Command $command
+     */
+    public function setCommand($command)
+    {
+        $this->command = $command;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        if ($this->command !== null) {
+            // help for an individual command
+            $output->page($this->command->asText());
+            $this->command = null;
+        } elseif ($name = $input->getArgument('command_name')) {
+            // help for an individual command
+            $output->page($this->getApplication()->get($name)->asText());
+        } else {
+            // list available commands
+            $commands = $this->getApplication()->all();
+
+            $table = $this->getTable($output);
+
+            foreach ($commands as $name => $command) {
+                if ($name !== $command->getName()) {
+                    continue;
+                }
+
+                if ($command->getAliases()) {
+                    $aliases = sprintf('<comment>Aliases:</comment> %s', implode(', ', $command->getAliases()));
+                } else {
+                    $aliases = '';
+                }
+
+                $table->addRow(array(
+                    sprintf('<info>%s</info>', $name),
+                    $command->getDescription(),
+                    $aliases,
+                ));
+            }
+
+            $output->startPaging();
+            if ($table instanceof TableHelper) {
+                $table->render($output);
+            } else {
+                $table->render();
+            }
+            $output->stopPaging();
+        }
+    }
+}