Updated validates_attachment_content_type doc to warn of IE tomfoolery.

lib/paperclip.rb

@@ -180,7 +180,11 @@ module Paperclip
     
     # Places ActiveRecord-style validations on the content type of the file assigned. The
     # possible options are:
-    # * +content_type+: Allowed content types.  Can be a single content type or an array.  Allows all by default.
+    # * +content_type+: Allowed content types.  Can be a single content type or an array.
+    #   Each type can be a String or a Regexp. It should be noted that Internet Explorer uploads
+    #   files with content_types that you may not expect. For example, JPEG images are given
+    #   image/pjpeg and PNGs are image/x-png, so keep that in mind when determining how you match.
+    #   Allows all by default.
     # * +message+: The message to display when the uploaded file has an invalid content type.
     def validates_attachment_content_type name, options = {}
       attachment_definitions[name][:validations] << lambda do |attachment, instance|