diff --git a/src/Exceptions/SpecValidation/MissingDefinitionException.php b/src/Exceptions/SpecValidation/MissingDefinitionException.php
deleted file mode 100644
index 36643ba1..00000000
--- a/src/Exceptions/SpecValidation/MissingDefinitionException.php
+++ /dev/null
@@ -1,15 +0,0 @@
-<?php
-
-namespace RonasIT\Support\AutoDoc\Exceptions\SpecValidation;
-
-use Exception;
-
-class MissingDefinitionException extends Exception
-{
-    public function __construct(array $definitions)
-    {
-        $definitionsString = implode(', ', $definitions);
-
-        parent::__construct("Validation failed. Definitions ({$definitionsString}) are used in \$refs but not defined in 'definitions' section.");
-    }
-}
diff --git a/src/Exceptions/SpecValidation/MissingRefException.php b/src/Exceptions/SpecValidation/MissingRefException.php
new file mode 100644
index 00000000..e0699f54
--- /dev/null
+++ b/src/Exceptions/SpecValidation/MissingRefException.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace RonasIT\Support\AutoDoc\Exceptions\SpecValidation;
+
+use Exception;
+
+class MissingRefException extends Exception
+{
+    public function __construct(string $ref, string $parentField)
+    {
+        parent::__construct("Validation failed. Ref '{$ref}' are used in \$ref but not defined in '{$parentField}' field.");
+    }
+}
diff --git a/src/Validators/SwaggerSpecValidator.php b/src/Validators/SwaggerSpecValidator.php
index 20448728..1bf9fc9f 100644
--- a/src/Validators/SwaggerSpecValidator.php
+++ b/src/Validators/SwaggerSpecValidator.php
@@ -10,7 +10,7 @@
 use RonasIT\Support\AutoDoc\Exceptions\SpecValidation\InvalidFieldValueException;
 use RonasIT\Support\AutoDoc\Exceptions\SpecValidation\InvalidSwaggerSpecException;
 use RonasIT\Support\AutoDoc\Exceptions\SpecValidation\InvalidSwaggerVersionException;
-use RonasIT\Support\AutoDoc\Exceptions\SpecValidation\MissingDefinitionException;
+use RonasIT\Support\AutoDoc\Exceptions\SpecValidation\MissingRefException;
 use RonasIT\Support\AutoDoc\Exceptions\SpecValidation\MissingFieldException;
 use RonasIT\Support\AutoDoc\Exceptions\SpecValidation\MissingPathParamException;
 use RonasIT\Support\AutoDoc\Exceptions\SpecValidation\MissingPathPlaceholderException;
@@ -50,7 +50,7 @@ class SwaggerSpecValidator
     ];
 
     public const PATH_PARAM_REGEXP = '#(?<={)[^/}]+(?=})#';
-    public const DEFINITION_REF_REGEXP = '/^#\/definitions\/.+/';
+    public const REF_REGEXP = '/^#\/(.+)\/(.+)/';
 
     public const MIME_TYPE_MULTIPART_FORM_DATA = 'multipart/form-data';
     public const MIME_TYPE_APPLICATION_URLENCODED = 'application/x-www-form-urlencoded';
@@ -75,6 +75,7 @@ public function validate(): void
         $this->validateDefinitions();
         $this->validateSecurityDefinitions();
         $this->validateTags();
+        $this->validateRefs();
     }
 
     protected function validateVersion(): void
@@ -107,6 +108,7 @@ protected function validatePaths(): void
                 }
 
                 $this->validateFieldsPresent($operation, self::REQUIRED_FIELDS['operation'], $operationId);
+                $this->validateFieldValue('schemes', $operation, self::AVAILABLE_VALUES['schemes'], $operationId);
 
                 $this->validateParameters($operation, $path, $operationId);
 
@@ -126,12 +128,6 @@ protected function validateDefinitions(): void
         foreach ($definitions as $index => $definition) {
             $this->validateFieldsPresent($definition, self::REQUIRED_FIELDS['definition'], "definitions.{$index}");
         }
-
-        $missingDefinitions = $this->getMissingFields($definitions, $this->getRefs());
-
-        if (!empty($missingDefinitions)) {
-            throw new MissingDefinitionException($missingDefinitions);
-        }
     }
 
     protected function validateSecurityDefinitions(): void
@@ -353,20 +349,23 @@ protected function validateFieldValue(string $fieldName, array $parent, array $a
         }
     }
 
-    protected function getRefs(): array
+    protected function validateRefs(): void
     {
-        $refs = [];
-
-        array_walk_recursive($this->doc, function ($item, $key) use (&$refs) {
+        array_walk_recursive($this->doc, function ($item, $key) {
             if (
                 ($key === '$ref')
-                && preg_match(self::DEFINITION_REF_REGEXP, $item)
+                && preg_match(self::REF_REGEXP, $item, $matches)
             ) {
-                $refs[] = str_replace('#/definitions/', '', $item);
+                $refParentKey = $matches[1];
+                $refKey = $matches[2];
+
+                $missingRefs = $this->getMissingFields(Arr::get($this->doc, $refParentKey, []), [$refKey]);
+
+                if (!empty($missingRefs)) {
+                    throw new MissingRefException($refKey, $refParentKey);
+                }
             }
         });
-
-        return array_unique($refs);
     }
 
     protected function validateParamsUnique(array $params): void
diff --git a/tests/SwaggerServiceTest.php b/tests/SwaggerServiceTest.php
index 4bb8c433..e90d5f24 100755
--- a/tests/SwaggerServiceTest.php
+++ b/tests/SwaggerServiceTest.php
@@ -12,7 +12,7 @@
 use RonasIT\Support\AutoDoc\Exceptions\SpecValidation\InvalidFieldValueException;
 use RonasIT\Support\AutoDoc\Exceptions\SpecValidation\InvalidSwaggerSpecException;
 use RonasIT\Support\AutoDoc\Exceptions\SpecValidation\InvalidSwaggerVersionException;
-use RonasIT\Support\AutoDoc\Exceptions\SpecValidation\MissingDefinitionException;
+use RonasIT\Support\AutoDoc\Exceptions\SpecValidation\MissingRefException;
 use RonasIT\Support\AutoDoc\Exceptions\SpecValidation\MissingFieldException;
 use RonasIT\Support\AutoDoc\Exceptions\SpecValidation\MissingPathParamException;
 use RonasIT\Support\AutoDoc\Exceptions\SpecValidation\MissingPathPlaceholderException;
@@ -202,8 +202,8 @@ public function getConstructorInvalidTmpData(): array
             ],
             [
                 'tmpDoc' => 'documentation__invalid_format__missing_definition',
-                'exception' => MissingDefinitionException::class,
-                'exceptionMessage' => "Validation failed. Definitions (loginObject) are used in \$refs but not defined in 'definitions' section."
+                'exception' => MissingRefException::class,
+                'exceptionMessage' => "Validation failed. Ref 'loginObject' are used in \$ref but not defined in 'definitions' field."
             ],
         ];
     }