diff --git a/README.md b/README.md
index 2a9d519..79bcf60 100644
--- a/README.md
+++ b/README.md
@@ -63,7 +63,7 @@ $price->getTaxRate();
 ## Usage
 <a name="calculate-the-gross-price"></a>
 ### Calculate the gross price
-To calculate the gross price (price with VAT added) use the `calculate` method with a net price, a country code, a postal code (null if unknow) and whether you're calculating VAT for a customer that's a company as paremeters.
+To calculate the gross price (price with VAT added) use the `calculate` method with a net price, a country code, a postal code (null if unknown) and whether you're calculating VAT for a customer that's a company as parameters.
 
 ```php
 $grossPrice = $vatCalculator->calculate(24.00, 'DE', null, false /* [, $rateType [, $dateTime]] */);
@@ -129,7 +129,7 @@ The given VAT numbers will be truncated and non relevant characters / whitespace
 
 This service relies on a third party SOAP API provided by the EU. If, for whatever reason, this API is unavailable a `VatCheckUnavailableException` will be thrown.
 
-If a VAT number from a unsupported/non-EU country is provided, `UnsupportedCountryException` will be thrown.
+If a VAT number from an unsupported/non-EU country is provided, `UnsupportedCountryException` will be thrown.
 
 ```php
 try {
diff --git a/UPGRADE.md b/UPGRADE.md
index 4076086..a4c2988 100644
--- a/UPGRADE.md
+++ b/UPGRADE.md
@@ -12,7 +12,7 @@
 * `getIPBasedCountry()` & `getClientIP()` methods have been removed, use some other package (or `CF-IPCountry` HTTP header if you're behind Cloudflare)
 * Some methods have been properly *camelCased*: methods like `getClientIP()` -> `getClientIp()` and `shouldCollectVAT` -> `shouldCollectVat` and a few more
 * `VATCheckUnavailableException` has been *camelCased* to `VatCheckUnavailableException`
-* If a VAT number from a unsupported/non-EU country is provided for validation or for `getVatDetails()` call, `UnsupportedCountryException` will be thrown
+* If a VAT number from an unsupported/non-EU country is provided for validation or for `getVatDetails()` call, `UnsupportedCountryException` will be thrown
 * VIES WSDL is now loaded over HTTPS, if you hit issues you should update your system's list of trusted CAs, or install [composer/ca-bundle](https://github.com/composer/ca-bundle), use it [with PHP streams](https://github.com/composer/ca-bundle#to-use-with-php-streams), create your own `SoapClient` instance with `stream_context` option (`new SoapClient(self::VAT_SERVICE_URL, ['stream_context' => $context])`) and use `VatCalculator::setSoapClient()` to use the custom client
 * Requires PHP 7.3