README.md in omniauth-google-oauth2-0.7.0 vs README.md in omniauth-google-oauth2-0.8.0

@@ -71,10 +71,10 @@
 
 * `access_type`: Defaults to `offline`, so a refresh token is sent to be used when the user is not present at the browser. Can be set to `online`. More about [offline access](https://developers.google.com/identity/protocols/OAuth2WebServer#offline)
 
 * `hd`: (Optional) Limit sign-in to a particular Google Apps hosted domain. This can be simply string `'domain.com'` or an array `%w(domain.com domain.co)`. More information at: https://developers.google.com/accounts/docs/OpenIDConnect#hd-param
 
-* `jwt_leeway`: Number of seconds passed to the JWT library as leeway. Defaults to 60 seconds.
+* `jwt_leeway`: Number of seconds passed to the JWT library as leeway. Defaults to 60 seconds. Note this only works if you use jwt 2.1, as the leeway option was removed in later versions.
 
 * `skip_jwt`: Skip JWT processing. This is for users who are seeing JWT decoding errors with the `iat` field. Always try adjusting the leeway before disabling JWT processing.
 
 * `login_hint`: When your app knows which user it is trying to authenticate, it can provide this parameter as a hint to the authentication server. Passing this hint suppresses the account chooser and either pre-fill the email box on the sign-in form, or select the proper session (if the user is using multiple sign-in), which can help you avoid problems that occur if your app logs in the wrong user account. The value can be either an email address or the sub string, which is equivalent to the user's Google+ ID.