diff --git a/README.md b/README.md
index 4afc77ba..6af69759 100644
--- a/README.md
+++ b/README.md
@@ -119,6 +119,9 @@ Search will now automatically search DMSF content when a Redmine search is perfo
 ####An inline picture with custom size
 `{{dmsf_image(8, size=300)}}`
 
+####An inline picture with custom size
+`{{dmsf_image(8, size=50%)}}`
+
 ####An inline picture with custom size
 `{{dmsf_image(8, size=640x480)}}`
 
diff --git a/init.rb b/init.rb
index 473db794..406f9581 100644
--- a/init.rb
+++ b/init.rb
@@ -181,7 +181,11 @@ Redmine::Plugin.register :redmine_dmsf do
         end
         raise 'Not supported image format' unless file.image?
         url = url_for(:controller => :dmsf_files, :action => 'view', :id => file)      
-        image_tag(url, :alt => file.title, :size => size)
+       if size.include? "%"
+          image_tag(url, :alt => file.title, :width => size, :height => size)
+        else
+          image_tag(url, :alt => file.title, :size => size)
+        end
       else
         raise "Document ID #{file_id} not found"
       end