diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 0488d9d..e8dc880 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -334,6 +334,8 @@
 
       -  Added custom filename to ``Email::attach()`` as ``$this->email->attach($filename, $disposition, $newname)``.
       -  Added possibility to send attachment as buffer string in ``Email::attach()`` as ``$this->email->attach($buffer, $disposition, $newname, $mime)``.
+      -  Email attachments are creating in function Email::attach() - it's faster for sending many emails with same attachments
+      -  Added method Email::attach_cid() returning CID which enables to embed an attachment to html.
       -  Added dsn (delivery status notification) option.
       -  Renamed method _set_header() to set_header() and made it public to enable adding custom headers in the :doc:`Email Library <libraries/email>`.
       -  Successfully sent emails will automatically clear the parameters.
diff --git a/user_guide_src/source/libraries/email.rst b/user_guide_src/source/libraries/email.rst
index 39629ec..90b7114 100644
--- a/user_guide_src/source/libraries/email.rst
+++ b/user_guide_src/source/libraries/email.rst
@@ -247,8 +247,8 @@
 ----------------------
 
 Enables you to send an attachment. Put the file path/name in the first
-parameter. Note: Use a file path, not a URL. For multiple attachments
-use the method multiple times. For example::
+parameter. For multiple attachments use the method multiple times.
+For example::
 
 	$this->email->attach('/path/to/photo1.jpg');
 	$this->email->attach('/path/to/photo2.jpg');
@@ -269,6 +269,26 @@
 
 	$this->email->attach($buffer, 'attachment', 'report.pdf', 'application/pdf');
 
+$this->email->attach_cid()
+ --------------------------
+ 
+ Returns CID which enables to embed an attachment to html. First parameter 
+ must be attached file.
+ 
+ ::
+ 
+   $filename = '/img/photo1.jpg';
+   $this->email->attach($filename);
+   foreach ($list as $address)
+   {
+     $this->email->to($address);
+     $cid = $this->email->attach_cid($filename);
+     $this->email->message('<img src='cid:". $cid ."' alt="photo1" />');
+     $this->email->send();
+   }
+ 
+ CID for each Email have to be create again to be unique.
+
 $this->email->print_debugger()
 ------------------------------