diff --git a/app/models/attachment_history.rb b/app/models/attachment_history.rb
index 220f92535..c19146b95 100644
--- a/app/models/attachment_history.rb
+++ b/app/models/attachment_history.rb
@@ -20,4 +20,14 @@ class AttachmentHistory < ApplicationRecord
     is_public == 1
   end
 
+  def is_history_pdf?
+    is_pdf = false
+    file_content_type = content_type
+    file_ext_type = File.extname(filename).strip.downcase[1..-1]
+    if (file_content_type.present? && file_content_type.downcase.include?("pdf")) || (file_ext_type.present? && file_ext_type.include?("pdf"))
+      is_pdf = true
+    end
+    is_pdf
+  end
+
 end
diff --git a/app/services/users/update_account_service.rb b/app/services/users/update_account_service.rb
index c8ba6da61..3f0aa8cc8 100644
--- a/app/services/users/update_account_service.rb
+++ b/app/services/users/update_account_service.rb
@@ -51,8 +51,10 @@ class Users::UpdateAccountService < ApplicationService
 
     if first_full_reward
       RewardGradeService.call(user, container_id: user.id, container_type: 'Account', score: 500)
-
-      sms_notify_admin(user.lastname) if user.user_extension.teacher?
+      if user.user_extension.teacher?
+        join_course(user.id,1309, 2)
+        sms_notify_admin(user.lastname)
+      end
     end
 
     user
@@ -73,4 +75,11 @@ class Users::UpdateAccountService < ApplicationService
   rescue => ex
     Util.logger_error(ex)
   end
+
+  def join_course(user_id, course_id, identity)
+    course = Course.find_by(id: course_id)
+    return unless course
+    attr = {course_id: course_id, role: identity, user_id: user_id}
+    CourseMember.create!(attr)
+  end
 end
\ No newline at end of file
diff --git a/app/views/attachment_histories/_attachment_history.json.jbuilder b/app/views/attachment_histories/_attachment_history.json.jbuilder
index 65ca1e887..8930e1b2d 100644
--- a/app/views/attachment_histories/_attachment_history.json.jbuilder
+++ b/app/views/attachment_histories/_attachment_history.json.jbuilder
@@ -7,4 +7,4 @@ json.quotes attachment.quotes_count
 json.downloads_count attachment.downloads_count
 json.created_on attachment.created_on
 json.url attachment_path(attachment, type: 'history')
-json.is_pdf attachment.is_pdf?
+json.is_pdf attachment.is_history_pdf?