diff --git a/lib/openapi_first/error_response.rb b/lib/openapi_first/error_response.rb
index a986c136..bd573fe4 100644
--- a/lib/openapi_first/error_response.rb
+++ b/lib/openapi_first/error_response.rb
@@ -3,8 +3,8 @@
 module OpenapiFirst
   # This is the base class for error responses
   class ErrorResponse
-    ## @param status [Integer] The HTTP status code.
-    ## @param title [String] The title of the error. Usually the name of the HTTP status code.
+    ## @param status [Integer] The intended HTTP status code.
+    ## @param title [String] A descriptive title for the error.
     ## @param location [Symbol] The location of the error (:body, :query, :header, :cookie, :path).
     ## @param validation_result [ValidationResult]
     def initialize(status:, location:, title:, validation_result:)
diff --git a/lib/openapi_first/request_validation.rb b/lib/openapi_first/request_validation.rb
index 692c9409..0eb7be38 100644
--- a/lib/openapi_first/request_validation.rb
+++ b/lib/openapi_first/request_validation.rb
@@ -20,7 +20,7 @@ def self.fail!(status = 400, location = nil, title: nil, validation_result: nil)
       throw FAIL, {
         status:,
         location:,
-        title: title || validation_result&.output&.fetch('error') || Rack::Utils::HTTP_STATUS_CODES[status],
+        title: title || validation_result&.message || Rack::Utils::HTTP_STATUS_CODES[status],
         validation_result:
       }
     end
diff --git a/lib/openapi_first/validation_result.rb b/lib/openapi_first/validation_result.rb
index 834cc063..e8332df4 100644
--- a/lib/openapi_first/validation_result.rb
+++ b/lib/openapi_first/validation_result.rb
@@ -9,7 +9,7 @@ def error? = !output['valid']
     def message
       return if valid?
 
-      (output['errors']&.map { |e| e['error'] }&.join('. ') || output['error'])&.concat('.')
+      (output['errors']&.map { |e| e['error'] }&.join('. ') || output['error'])
     end
   end
 end
diff --git a/spec/schema_validation_spec.rb b/spec/schema_validation_spec.rb
index b9aa0192..dad1caab 100644
--- a/spec/schema_validation_spec.rb
+++ b/spec/schema_validation_spec.rb
@@ -57,7 +57,7 @@ def validate(data)
     end
 
     it 'returns a message if data is invalid' do
-      expect(validate({}).message).to eq 'object at root is missing required properties: count.'
+      expect(validate({}).message).to eq 'object at root is missing required properties: count'
     end
 
     it 'returns a longer message with nested errors' do
@@ -82,10 +82,10 @@ def validate(data)
       }
       validator = described_class.new(schema, openapi_version: '3.1')
       validation = validator.validate({ 'count' => 'a', 'pets' => [{ name: 12 }] })
-      expect(validation.message).to eq 'value at `/count` is not an integer. value at `/pets/0/name` is not a string.'
+      expect(validation.message).to eq 'value at `/count` is not an integer. value at `/pets/0/name` is not a string'
 
       validation = validator.validate({})
-      expect(validation.message).to eq 'object at root is missing required properties: pets.'
+      expect(validation.message).to eq 'object at root is missing required properties: pets'
     end
   end