diff --git a/app/models/attachment.rb b/app/models/attachment.rb
index 9fd858bf..a7d87480 100644
--- a/app/models/attachment.rb
+++ b/app/models/attachment.rb
@@ -1,45 +1,45 @@
-# == Schema Information
-#
-# Table name: attachments
-#
-#  id                        :integer          not null, primary key
-#  container_id              :integer
-#  container_type            :string(30)
-#  filename                  :string(255)      default(""), not null
-#  disk_filename             :string(255)      default(""), not null
-#  filesize                  :integer          default("0"), not null
-#  content_type              :string(255)      default("")
-#  digest                    :string(60)       default(""), not null
-#  downloads                 :integer          default("0"), not null
-#  author_id                 :integer          default("0"), not null
-#  created_on                :datetime
-#  description               :text(65535)
-#  disk_directory            :string(255)
-#  attachtype                :integer          default("1")
-#  is_public                 :integer          default("1")
-#  copy_from                 :integer
-#  quotes                    :integer          default("0")
-#  is_publish                :integer          default("1")
-#  publish_time              :datetime
-#  resource_bank_id          :integer
-#  unified_setting           :boolean          default("1")
-#  cloud_url                 :string(255)      default("")
-#  course_second_category_id :integer          default("0")
-#  delay_publish             :boolean          default("0")
-#  memo_image                :boolean          default("0")
-#  extra_type                :integer          default("0")
-#  uuid                      :string(255)
-#
-# Indexes
-#
-#  index_attachments_on_author_id                        (author_id)
-#  index_attachments_on_container_id_and_container_type  (container_id,container_type)
-#  index_attachments_on_course_second_category_id        (course_second_category_id)
-#  index_attachments_on_created_on                       (created_on)
-#  index_attachments_on_is_public                        (is_public)
-#  index_attachments_on_quotes                           (quotes)
-#
-
+# == Schema Information
+#
+# Table name: attachments
+#
+#  id                        :integer          not null, primary key
+#  container_id              :integer
+#  container_type            :string(30)
+#  filename                  :string(255)      default(""), not null
+#  disk_filename             :string(255)      default(""), not null
+#  filesize                  :integer          default("0"), not null
+#  content_type              :string(255)      default("")
+#  digest                    :string(60)       default(""), not null
+#  downloads                 :integer          default("0"), not null
+#  author_id                 :integer          default("0"), not null
+#  created_on                :datetime
+#  description               :text(65535)
+#  disk_directory            :string(255)
+#  attachtype                :integer          default("1")
+#  is_public                 :integer          default("1")
+#  copy_from                 :integer
+#  quotes                    :integer          default("0")
+#  is_publish                :integer          default("1")
+#  publish_time              :datetime
+#  resource_bank_id          :integer
+#  unified_setting           :boolean          default("1")
+#  cloud_url                 :string(255)      default("")
+#  course_second_category_id :integer          default("0")
+#  delay_publish             :boolean          default("0")
+#  memo_image                :boolean          default("0")
+#  extra_type                :integer          default("0")
+#  uuid                      :string(255)
+#
+# Indexes
+#
+#  index_attachments_on_author_id                        (author_id)
+#  index_attachments_on_container_id_and_container_type  (container_id,container_type)
+#  index_attachments_on_course_second_category_id        (course_second_category_id)
+#  index_attachments_on_created_on                       (created_on)
+#  index_attachments_on_is_public                        (is_public)
+#  index_attachments_on_quotes                           (quotes)
+#
+
 
 
 
@@ -72,7 +72,7 @@ class Attachment < ApplicationRecord
   scope :unified_setting, -> {where("unified_setting = ? ", 1)}
   scope :where_id_or_uuid, -> (id) { (Float(id) rescue nil).present? ? where(id: id) : where(uuid: id) }
 
-  validates_length_of :description, maximum: 100, message: "不能超过100个字符"
+  validates_length_of :description, maximum: 255, message: "不能超过255个字符"
 
   DCODES = %W(2 3 4 5 6 7 8 9 a b c f e f g h i j k l m n o p q r s t u v w x y z)