diff --git a/CHANGELOG.md b/CHANGELOG.md
index 027dea7..15293e5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Added
 
+- `ExplainCommand`
+	- explains cron expression syntax
 - `ListCommand`
 	- adds `--explain` option to explain whole expression
 
diff --git a/src/Command/ExplainCommand.php b/src/Command/ExplainCommand.php
new file mode 100644
index 0000000..b07b468
--- /dev/null
+++ b/src/Command/ExplainCommand.php
@@ -0,0 +1,73 @@
+<?php declare(strict_types = 1);
+
+namespace Orisai\Scheduler\Command;
+
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+final class ExplainCommand extends Command
+{
+
+	public static function getDefaultName(): string
+	{
+		return 'scheduler:explain';
+	}
+
+	public static function getDefaultDescription(): string
+	{
+		return 'Explain cron expression';
+	}
+
+	protected function execute(InputInterface $input, OutputInterface $output): int
+	{
+		$this->explainSyntax($output);
+
+		return 0;
+	}
+
+	private function explainSyntax(OutputInterface $output): void
+	{
+		$output->writeln(
+			<<<'CMD'
+<fg=yellow>*   *   *   *   *</>
+-   -   -   -   -
+|   |   |   |   |
+|   |   |   |   |
+|   |   |   |   +----- day of week (<fg=yellow>0-7</>) (Sunday = <fg=yellow>0</> or <fg=yellow>7</>) (or <fg=yellow>SUN-SAT</>)
+|   |   |   +--------- month (<fg=yellow>1-12</>) (or <fg=yellow>JAN-DEC</>)
+|   |   +------------- day of month (<fg=yellow>1-31</>)
+|   +----------------- hour (<fg=yellow>0-23</>)
++--------------------- minute (<fg=yellow>0-59</>)
+
+Each part of expression can also use wildcard, lists, ranges and steps:
+
+- wildcard - match always
+  - e.g. <fg=yellow>* * * * *</> - At every minute.
+- lists - match list of values, ranges and steps
+  - e.g. <fg=yellow>15,30 * * * *</> - At minute 15 and 30.
+- ranges - match values in range
+  - e.g. <fg=yellow>1-9 * * * *</> - At every minute from 1 through 9.
+- steps - match every nth value in range
+  - e.g. <fg=yellow>*/5 * * * *</> - At every 5th minute.
+  - e.g. <fg=yellow>0-30/5 * * * *</> - At every 5th minute from 0 through 30.
+- combinations
+  - e.g. <fg=yellow>0-14,30-44 * * * *</> - At every minute from 0 through 14 and every minute from 30 through 44.
+
+You can also use macro instead of an expression:
+
+- <fg=yellow>@yearly</>, <fg=yellow>@annually</> - Run once a year, midnight, Jan. 1 (same as <fg=yellow>0 0 1 1 *</>)
+- <fg=yellow>@monthly</> - Run once a month, midnight, first of month (same as <fg=yellow>0 0 1 * *</>)
+- <fg=yellow>@weekly</> - Run once a week, midnight on Sun (same as <fg=yellow>0 0 * * 0</>)
+- <fg=yellow>@daily</>, <fg=yellow>@midnight</> - Run once a day, midnight (same as <fg=yellow>0 0 * * *</>)
+- <fg=yellow>@hourly</> - Run once an hour, first minute (same as <fg=yellow>0 * * * *</>)
+
+Although they are not part of cron expression syntax, you can also add to job:
+
+- seconds - repeat job every n seconds
+- timezone - run only when cron expression matches within given timezone
+CMD,
+		);
+	}
+
+}
diff --git a/tests/Unit/Command/ExplainCommandTest.php b/tests/Unit/Command/ExplainCommandTest.php
new file mode 100644
index 0000000..b060d1f
--- /dev/null
+++ b/tests/Unit/Command/ExplainCommandTest.php
@@ -0,0 +1,77 @@
+<?php declare(strict_types = 1);
+
+namespace Tests\Orisai\Scheduler\Unit\Command;
+
+use Orisai\Scheduler\Command\ExplainCommand;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Console\Tester\CommandTester;
+use function array_map;
+use function explode;
+use function implode;
+use function putenv;
+use function rtrim;
+use const PHP_EOL;
+
+final class ExplainCommandTest extends TestCase
+{
+
+	public function testBasicExplain(): void
+	{
+		$command = new ExplainCommand();
+		$tester = new CommandTester($command);
+
+		putenv('COLUMNS=80');
+		$code = $tester->execute([]);
+
+		self::assertSame(
+			<<<'MSG'
+*   *   *   *   *
+-   -   -   -   -
+|   |   |   |   |
+|   |   |   |   |
+|   |   |   |   +----- day of week (0-7) (Sunday = 0 or 7) (or SUN-SAT)
+|   |   |   +--------- month (1-12) (or JAN-DEC)
+|   |   +------------- day of month (1-31)
+|   +----------------- hour (0-23)
++--------------------- minute (0-59)
+
+Each part of expression can also use wildcard, lists, ranges and steps:
+
+- wildcard - match always
+  - e.g. * * * * * - At every minute.
+- lists - match list of values, ranges and steps
+  - e.g. 15,30 * * * * - At minute 15 and 30.
+- ranges - match values in range
+  - e.g. 1-9 * * * * - At every minute from 1 through 9.
+- steps - match every nth value in range
+  - e.g. */5 * * * * - At every 5th minute.
+  - e.g. 0-30/5 * * * * - At every 5th minute from 0 through 30.
+- combinations
+  - e.g. 0-14,30-44 * * * * - At every minute from 0 through 14 and every minute from 30 through 44.
+
+You can also use macro instead of an expression:
+
+- @yearly, @annually - Run once a year, midnight, Jan. 1 (same as 0 0 1 1 *)
+- @monthly - Run once a month, midnight, first of month (same as 0 0 1 * *)
+- @weekly - Run once a week, midnight on Sun (same as 0 0 * * 0)
+- @daily, @midnight - Run once a day, midnight (same as 0 0 * * *)
+- @hourly - Run once an hour, first minute (same as 0 * * * *)
+
+Although they are not part of cron expression syntax, you can also add to job:
+
+- seconds - repeat job every n seconds
+- timezone - run only when cron expression matches within given timezone
+
+MSG,
+			implode(
+				PHP_EOL,
+				array_map(
+					static fn (string $s): string => rtrim($s),
+					explode(PHP_EOL, $tester->getDisplay()),
+				),
+			),
+		);
+		self::assertSame($command::SUCCESS, $code);
+	}
+
+}