diff --git a/designdocs/sku.pod b/designdocs/sku.pod
index a5377d87c..3a1f518a8 100644
--- a/designdocs/sku.pod
+++ b/designdocs/sku.pod
@@ -8,10 +8,11 @@ needs to be simple so it can be extended to fit any need.
 The following fields are needed to construct this assets table called
 E<acirc>E<128>E<156>SKUE<acirc>E<128>E<157>.
 
- Field         Schema              Description
- assetId       guid                The unique id assigned to this sku that may never change. It's with all assets 
- sku           varchar(35) unique  The unique id that the shop keeper assigns to this item. It may be changed by the shop keeper. By default this is set equal to assetId.
- vendorId      guid                The unique id of the vendor associated with this sku, if any
+ Field              Schema              Description
+ assetId            guid                The unique id assigned to this sku that may never change. It's with all assets 
+ sku                varchar(35) unique  The unique id that the shop keeper assigns to this item. It may be changed by the shop keeper. By default this is set equal to assetId.
+ vendorId           guid                The unique id of the vendor associated with this sku, if any
+ taxRateOverride    float               An override value for the default tax rate.
 
 =head2 Method Dictionary
 
@@ -47,6 +48,10 @@ should return the number that are currently in stock.
 
 By default return 0.00. Should be overridden by subclasses.
 
+=head3 getTaxRate
+
+Returns undef. However, if the user specifies a tax override in this Sku then it returns the special tax rate.
+
 =head3 isShippingRequired
 
 By default return 0. Should be overridden by subclasses.