diff --git a/source/key-concepts/parameters.md b/source/key-concepts/parameters.md
index 1119d709..8b1f3a16 100644
--- a/source/key-concepts/parameters.md
+++ b/source/key-concepts/parameters.md
@@ -1,15 +1,17 @@
 # Parameters
 
-A parameter is a numeric property of the legislation which can evolve over time.
+A parameter is a property of the legislation that changes over time.
 
-Unlike a [variable](./variables.md), a parameter is **not** specific to a specific person or family.
+Unlike a [variable](./variables.md), a parameter is **not** specific to a specific entity (person, household…).
 
 For instance:
 
-* The amount of the *minimum wage*
-* The amount of *family allowance per children*
-* The *marginal tax scale* used to calculate the income tax
+- the amount of the minimum wage;
+- the amount of family allowance per children;
+- the marginal tax scale used to calculate the income tax;
+- the maximum age at which a person is entitled to some benefits;
+- the list of regions in which a tax is applicable…
 
 Parameters are used in [formulas](./variables.md#formulas) to calculate variable values.
 
-[Read more about their implementation in OpenFisca](../coding-the-legislation/legislation_parameters.md)
+[Read more about their implementation in OpenFisca](../coding-the-legislation/legislation_parameters.md).