diff --git a/README.md b/README.md
index 5ebfc44..3e96947 100644
--- a/README.md
+++ b/README.md
@@ -53,6 +53,7 @@ Each invoice can have the following keys:
  * :items       - a list of items to be paid for
  * :imap        - (optional) email credentials. These are needed if a confirmation email is to be sent
  * :callbacks   - (optional) a list of commands to be called with the resulting pdf file
+ * :seller      - (optional) invoice specific overrides for the seller object
 
 ### Buyer
 
diff --git a/src/invoices/core.clj b/src/invoices/core.clj
index 978134b..c431798 100644
--- a/src/invoices/core.clj
+++ b/src/invoices/core.clj
@@ -38,10 +38,11 @@
 
 (defn prepare-invoice [{seller :seller font :font-path} month worklogs invoice]
   (-> invoice
-      (assoc :seller seller)
+      (update :seller (partial merge seller))
       (assoc :font-path font)
       (calc-prices worklogs)))
 
+
 (defn process-invoices [{invoices :invoices :as config} month worklogs]
   (let [invoices (map (partial prepare-invoice config month worklogs) invoices)]
     (doseq [[i invoice] (map-indexed vector invoices)]