diff --git a/README.md b/README.md
index 41b4545..6d2998f 100644
--- a/README.md
+++ b/README.md
@@ -56,6 +56,7 @@ This extension specifies types of values passed to:
 * `Assert::classExists`
 * `Assert::interfaceExists`
 * `Assert::validArrayKey`
+* `Assert::count`
 * `Assert::minCount`
 * `Assert::inArray`
 * `Assert::oneOf`
diff --git a/src/Type/WebMozartAssert/AssertTypeSpecifyingExtension.php b/src/Type/WebMozartAssert/AssertTypeSpecifyingExtension.php
index 1c9e733..7e3014a 100644
--- a/src/Type/WebMozartAssert/AssertTypeSpecifyingExtension.php
+++ b/src/Type/WebMozartAssert/AssertTypeSpecifyingExtension.php
@@ -395,6 +395,15 @@ private static function getExpressionResolvers(): array
 						[$class]
 					);
 				},
+				'count' => function (Scope $scope, Arg $array, Arg $number): \PhpParser\Node\Expr {
+					return new \PhpParser\Node\Expr\BinaryOp\Identical(
+						new \PhpParser\Node\Expr\FuncCall(
+							new \PhpParser\Node\Name('count'),
+							[$array]
+						),
+						$number->value
+					);
+				},
 				'minCount' => function (Scope $scope, Arg $array, Arg $number): \PhpParser\Node\Expr {
 					return new \PhpParser\Node\Expr\BinaryOp\GreaterOrEqual(
 						new \PhpParser\Node\Expr\FuncCall(
diff --git a/tests/Type/WebMozartAssert/data/data.php b/tests/Type/WebMozartAssert/data/data.php
index fbfc5ae..0d1866b 100644
--- a/tests/Type/WebMozartAssert/data/data.php
+++ b/tests/Type/WebMozartAssert/data/data.php
@@ -174,6 +174,14 @@ public function doFoo($a, $b, array $c, iterable $d, $e, $f, $g, $h, $i, $j, $k,
 
 		Assert::interfaceExists($ag);
 		\PHPStan\Testing\assertType('class-string', $ag);
+
+		/** @var int[] $at */
+		$at = doFoo();
+		Assert::count($at, 1);
+		$au = array_pop($at);
+		$av = array_pop($at);
+		\PHPStan\Testing\assertType('int', $au);
+		\PHPStan\Testing\assertType('int|null', $av);
     }
 
 }