diff --git a/dictionaries/CallMap.php b/dictionaries/CallMap.php
index 9f31a7a44d4..815d4ea315a 100644
--- a/dictionaries/CallMap.php
+++ b/dictionaries/CallMap.php
@@ -2519,7 +2519,7 @@
 'enchant_dict_store_replacement' => ['void', 'dictionary'=>'resource', 'misspelled'=>'string', 'correct'=>'string'],
 'enchant_dict_suggest' => ['array', 'dictionary'=>'resource', 'word'=>'string'],
 'end' => ['mixed|false', '&r_array'=>'array|object'],
-'enum_exists' => ['bool', 'class' => 'class-string', 'autoload=' => 'bool'],
+'enum_exists' => ['bool', 'class' => 'string', 'autoload=' => 'bool'],
 'Error::__clone' => ['void'],
 'Error::__construct' => ['void', 'message='=>'string', 'code='=>'int', 'previous='=>'?Throwable|?Error'],
 'Error::__toString' => ['string'],
@@ -7504,7 +7504,7 @@
 'MessageFormatter::parseMessage' => ['array|false', 'locale'=>'string', 'pattern'=>'string', 'source'=>'string'],
 'MessageFormatter::setPattern' => ['bool', 'pattern'=>'string'],
 'metaphone' => ['string|false', 'string'=>'string', 'max_phonemes='=>'int'],
-'method_exists' => ['bool', 'object_or_class'=>'object|class-string|interface-string', 'method'=>'string'],
+'method_exists' => ['bool', 'object_or_class'=>'object|class-string|interface-string|enum-string', 'method'=>'string'],
 'mhash' => ['string', 'algo'=>'int', 'data'=>'string', 'key='=>'string'],
 'mhash_count' => ['int'],
 'mhash_get_block_size' => ['int|false', 'algo'=>'int'],
diff --git a/dictionaries/CallMap_81_delta.php b/dictionaries/CallMap_81_delta.php
index 81bc19a890f..350368df08a 100644
--- a/dictionaries/CallMap_81_delta.php
+++ b/dictionaries/CallMap_81_delta.php
@@ -17,7 +17,7 @@
 return [
   'added' => [
     'array_is_list' => ['bool', 'array' => 'array'],
-    'enum_exists' => ['bool', 'class' => 'class-string', 'autoload=' => 'bool'],
+    'enum_exists' => ['bool', 'class' => 'string', 'autoload=' => 'bool'],
     'fsync' => ['bool', 'stream' => 'resource'],
     'fdatasync' => ['bool', 'stream' => 'resource'],
     'imageavif' => ['bool', 'image'=>'GdImage', 'file='=>'resource|string|null', 'quality='=>'int', 'speed='=>'int'],
diff --git a/dictionaries/CallMap_historical.php b/dictionaries/CallMap_historical.php
index 362a181db8c..05b9964f8cd 100644
--- a/dictionaries/CallMap_historical.php
+++ b/dictionaries/CallMap_historical.php
@@ -12998,7 +12998,7 @@
     'memory_get_peak_usage' => ['int', 'real_usage='=>'bool'],
     'memory_get_usage' => ['int', 'real_usage='=>'bool'],
     'metaphone' => ['string|false', 'string'=>'string', 'max_phonemes='=>'int'],
-    'method_exists' => ['bool', 'object_or_class'=>'object|class-string|interface-string', 'method'=>'string'],
+    'method_exists' => ['bool', 'object_or_class'=>'object|class-string|interface-string|enum-string', 'method'=>'string'],
     'mhash' => ['string', 'algo'=>'int', 'data'=>'string', 'key='=>'string'],
     'mhash_count' => ['int'],
     'mhash_get_block_size' => ['int|false', 'algo'=>'int'],
diff --git a/docs/annotating_code/type_syntax/atomic_types.md b/docs/annotating_code/type_syntax/atomic_types.md
index 5fa957be454..b203957ed61 100644
--- a/docs/annotating_code/type_syntax/atomic_types.md
+++ b/docs/annotating_code/type_syntax/atomic_types.md
@@ -10,6 +10,7 @@ Atomic types are the basic building block of all type information used in Psalm.
 - [string](scalar_types.md)
 - [class-string and class-string<Foo>](scalar_types.md#class-string-interface-string)
 - [trait-string](scalar_types.md#trait-string)
+- [enum-string](scalar_types.md#enum-string)
 - [callable-string](scalar_types.md#callable-string)
 - [numeric-string](scalar_types.md#numeric-string)
 - [literal-string](scalar_types.md#literal-string)
diff --git a/docs/annotating_code/type_syntax/scalar_types.md b/docs/annotating_code/type_syntax/scalar_types.md
index ff99acc7e2a..6aed0a5212d 100644
--- a/docs/annotating_code/type_syntax/scalar_types.md
+++ b/docs/annotating_code/type_syntax/scalar_types.md
@@ -42,6 +42,10 @@ You can also parameterize `class-string` with an object name e.g. [`class-string
 
 Psalm also supports a `trait-string` annotation denote a trait that exists.
 
+### enum-string
+
+Psalm also supports a `enum-string` annotation denote an enum that exists.
+
 ### callable-string
 
 `callable-string` denotes a string value that has passed an `is_callable` check.
diff --git a/src/Psalm/Internal/Analyzer/Statements/Expression/AssertionFinder.php b/src/Psalm/Internal/Analyzer/Statements/Expression/AssertionFinder.php
index 123a6cfbc8f..7e60faecaef 100644
--- a/src/Psalm/Internal/Analyzer/Statements/Expression/AssertionFinder.php
+++ b/src/Psalm/Internal/Analyzer/Statements/Expression/AssertionFinder.php
@@ -787,6 +787,14 @@ public static function processFunctionCall(
                     $if_types[$first_var_name] = [['=trait-string']];
                 }
             }
+        } elseif ($class_exists_check_type = self::hasEnumExistsCheck($expr)) {
+            if ($first_var_name) {
+                if ($class_exists_check_type === 2) {
+                    $if_types[$first_var_name] = [['enum-string']];
+                } else {
+                    $if_types[$first_var_name] = [['=enum-string']];
+                }
+            }
         } elseif (self::hasInterfaceExistsCheck($expr)) {
             if ($first_var_name) {
                 $if_types[$first_var_name] = [['interface-string']];
diff --git a/src/Psalm/Internal/Type/AssertionReconciler.php b/src/Psalm/Internal/Type/AssertionReconciler.php
index d1611accfa8..df873178cc6 100644
--- a/src/Psalm/Internal/Type/AssertionReconciler.php
+++ b/src/Psalm/Internal/Type/AssertionReconciler.php
@@ -1026,6 +1026,7 @@ private static function handleLiteralEquality(
             || $scalar_type === 'interface-string'
             || $scalar_type === 'callable-string'
             || $scalar_type === 'trait-string'
+            || $scalar_type === 'enum-string'
         ) {
             return self::handleLiteralEqualityWithString(
                 $statements_analyzer,
@@ -1313,6 +1314,7 @@ private static function handleLiteralEqualityWithString(
                 if ($scalar_type === 'class-string'
                     || $scalar_type === 'interface-string'
                     || $scalar_type === 'trait-string'
+                    || $scalar_type === 'enum-string'
                 ) {
                     return $literal_asserted_type_classstring;
                 }
@@ -1324,6 +1326,7 @@ private static function handleLiteralEqualityWithString(
                 if ($scalar_type === 'class-string'
                     || $scalar_type === 'interface-string'
                     || $scalar_type === 'trait-string'
+                    || $scalar_type === 'enum-string'
                 ) {
                     return $literal_asserted_type_classstring;
                 }
@@ -1347,6 +1350,7 @@ private static function handleLiteralEqualityWithString(
                     if ($scalar_type === 'class-string'
                         || $scalar_type === 'interface-string'
                         || $scalar_type === 'trait-string'
+                        || $scalar_type === 'enum-string'
                     ) {
                         return $literal_asserted_type_classstring;
                     }
@@ -1615,6 +1619,7 @@ private static function getCompatibleStringType(
                 if ($scalar_type === 'class-string'
                     || $scalar_type === 'interface-string'
                     || $scalar_type === 'trait-string'
+                    || $scalar_type === 'enum-string'
                 ) {
                     $asserted_type = new Union([new TLiteralClassString($value)]);
                     $asserted_type->from_docblock = $existing_var_type->from_docblock;
diff --git a/src/Psalm/Internal/Type/NegatedAssertionReconciler.php b/src/Psalm/Internal/Type/NegatedAssertionReconciler.php
index b3387f378d7..82290aca1ba 100644
--- a/src/Psalm/Internal/Type/NegatedAssertionReconciler.php
+++ b/src/Psalm/Internal/Type/NegatedAssertionReconciler.php
@@ -313,6 +313,7 @@ private static function handleLiteralNegatedEquality(
             || $scalar_type === 'interface-string'
             || $scalar_type === 'trait-string'
             || $scalar_type === 'callable-string'
+            || $scalar_type === 'enum-string'
         ) {
             if ($existing_var_type->hasString()) {
                 if ($existing_string_types = $existing_var_type->getLiteralStrings()) {
diff --git a/src/Psalm/Internal/Type/TypeParser.php b/src/Psalm/Internal/Type/TypeParser.php
index 20c9308b2bd..a2443527640 100644
--- a/src/Psalm/Internal/Type/TypeParser.php
+++ b/src/Psalm/Internal/Type/TypeParser.php
@@ -617,7 +617,10 @@ private static function getTypeFromGenericTree(
             return new TNonEmptyList($generic_params[0]);
         }
 
-        if ($generic_type_value === 'class-string' || $generic_type_value === 'interface-string') {
+        if ($generic_type_value === 'class-string'
+            || $generic_type_value === 'interface-string'
+            || $generic_type_value === 'enum-string'
+        ) {
             $class_name = (string)$generic_params[0];
 
             if (isset($template_type_map[$class_name])) {
diff --git a/src/Psalm/Internal/Type/TypeTokenizer.php b/src/Psalm/Internal/Type/TypeTokenizer.php
index 020a3b270ca..275aba4fb40 100644
--- a/src/Psalm/Internal/Type/TypeTokenizer.php
+++ b/src/Psalm/Internal/Type/TypeTokenizer.php
@@ -44,6 +44,7 @@ class TypeTokenizer
         'numeric-string' => true,
         'class-string' => true,
         'interface-string' => true,
+        'enum-string' => true,
         'trait-string' => true,
         'callable-string' => true,
         'callable-array' => true,
diff --git a/src/Psalm/Type/Atomic.php b/src/Psalm/Type/Atomic.php
index 91378836e53..0726c74b037 100644
--- a/src/Psalm/Type/Atomic.php
+++ b/src/Psalm/Type/Atomic.php
@@ -271,6 +271,7 @@ public static function create(
 
             case 'class-string':
             case 'interface-string':
+            case 'enum-string':
                 return new TClassString();
 
             case 'trait-string':
diff --git a/stubs/Reflection.phpstub b/stubs/Reflection.phpstub
index 15df6c68d3b..b573c8d17df 100644
--- a/stubs/Reflection.phpstub
+++ b/stubs/Reflection.phpstub
@@ -13,7 +13,7 @@ class ReflectionClass implements Reflector {
     public $name;
 
     /**
-     * @param T|class-string<T>|interface-string<T>|trait-string $argument
+     * @param T|class-string<T>|interface-string<T>|trait-string|enum-string<T> $argument
      */
     public function __construct($argument) {}