diff --git a/contract_variable_quantity/README.rst b/contract_variable_quantity/README.rst
index 7dccb894..4518b00e 100644
--- a/contract_variable_quantity/README.rst
+++ b/contract_variable_quantity/README.rst
@@ -7,7 +7,7 @@ Variable quantity in contract recurrent invoicing
 =================================================
 
 With this module, you will be able to define in recurring contracts some
-lines with variable quantity according a provided formula.
+lines with variable quantity according to a provided formula.
 
 Configuration
 =============