diff --git a/README b/README
index 536e64e..ac03e6b 100644
--- a/README
+++ b/README
@@ -2,6 +2,6 @@ Fork of Embedded plugin (http://www.redmine.org/wiki/redmine/PluginEmbedded).
 Correct style and search for all Doxygen versions.
 Setup:
 Index files: index.html
-Valid extensions: html png gif js css
+Valid extensions: html png gif js css pdf
 Default template: doxygen.
 Menu caption: Doxygen
diff --git a/app/controllers/redmine_embedded_controller.rb b/app/controllers/redmine_embedded_controller.rb
index 737c442..149b131 100644
--- a/app/controllers/redmine_embedded_controller.rb
+++ b/app/controllers/redmine_embedded_controller.rb
@@ -56,6 +56,9 @@ class RedmineEmbeddedController < ApplicationController
     elsif path.match('\.js$')
       raw=File.read(path)
       send_data raw, :disposition => 'inline', :type => "text/javascript", :streaming => "true"
+    elsif path.match('\.pdf$')
+      raw=File.read(path)
+      send_data raw, :disposition => 'inline', :type => "application/pdf", :streaming => "true"
     else
       embed_file path
     end