diff --git a/src/avalara/transaction_builder_methods.py b/src/avalara/transaction_builder_methods.py
index 7a10356..14aeb90 100644
--- a/src/avalara/transaction_builder_methods.py
+++ b/src/avalara/transaction_builder_methods.py
@@ -78,7 +78,7 @@ def with_address(self, address_type, address):
                             of the location.
             city          City of the location.
             region        State or Region of the location.
-            postal_code    Postal/zip code of the location.
+            postalCode    Postal/zip code of the location.
             country       The two-letter country code of the location.
         :return: TransactionBuilder
         """
@@ -101,7 +101,7 @@ def with_line_address(self, address_type, address):
                             of the location.
             city          City of the location.
             region        State or Region of the location.
-            postal_code    Postal/zip code of the location.
+            postalCode    Postal/zip code of the location.
             country       The two-letter country code of the location.
         :return: TransactionBuilder
         """
@@ -313,7 +313,7 @@ def with_separate_address_line(self, amount, type_, address):
                             of the location.
             city          City of the location.
             region        State or Region of the location.
-            postal_code    Postal/zip code of the location.
+            postalCode    Postal/zip code of the location.
             country       The two-letter country code of the location.
         :return: TransactionBuilder
         """