# Set Commission Modifier with Customer Email
**GoAffPro** provides you with the option to set a commission modifier with the customer email matches rule.
To set a commission modifier with the customer email matches rule, go to the **Commission Modifiers** section in the **Commissions** tab of the GoAffPro admin panel.
Commissions > Commission modifiers
Here, click on **Add new modifier**.
Now, select the customer email matches rule.
After this, set the value.
{% hint style="info" %}
**For example:** Here we have selected the Customer email matches rule. So, if the email address of the customer (here: ) who has placed the order, matches the value set in the matches field, the affiliate's commission will get adjusted by the commission rate set in the modifier.
{% endhint %}
Now, set the commission rate for the rule.
{% hint style="info" %}
**For example:** Since the customer (identified using the email address: ) is using this affiliate's referral for placing repeated orders, we reward this affiliate with a higher commission rate by adjusting it by 20 percent.
{% endhint %}
Finally, click on **Add Modifier**.
The newly created commission modifier will appear in the Commission Modifier section of the Commissions tab.
{% hint style="info" %}
The commission modifier that we have set here as an example, will adjust the affiliate's commission by 20 percent whenever the customer with the email address makes a purchase using their referral.
{% endhint %}
