Update modern-theme-overrides.md

powerapps-docs/maker/model-driven-apps/modern-theme-overrides.md

@@ -78,7 +78,7 @@ After you select your colors and create the web resource, follow these steps to
 1. In the solution you used to [create the web resource](#create-the-web-resource), select **Add existing** > **More** > **Setting**.
 1. Type *Override* in the **Search** box, select **Override app header color**, select **Next**, and then select **Add**.
 1. In the solution, select **Override app header color**, and then select **Edit** on the command bar.
-1. On the right **Edit Override app header color** properties pane, select **Setting environment value** and enter the unique name of your web resource you created earlier. Make sure to add the publisher prefix for the web resource and don't include quotes. For example, the name might appear as *contoso_xmlfor-modern-theme* as in this example.
+1. On the right **Edit Override app header color** properties pane, select **Setting environment value** and enter the unique name of your web resource you created earlier. The name can be up to 50 characters in length. Make sure to add the publisher prefix for the web resource and don't include quotes. For example, the name might appear as *contoso_xmlfor-modern-theme* as in this example.
    :::image type="content" source="media/environment-setting-theme.png" alt-text="Environment setting for a theme with web resource unique name contoso_xmlfor-modern-theme." lightbox="media/environment-setting-theme.png":::
 1. Select **Save**.
 1. Select **Publish all customizations** on the command bar. (This command appears when no components in the solution are selected).