Updated FAQ

FAQ.md

@@ -255,8 +255,11 @@ The following Android permissions are needed:
 * Optional: *read your contacts* (READ_CONTACTS): to autocomplete addresses and to show photos
 * Optional: *read the contents of your SD card* (READ_EXTERNAL_STORAGE): to accept files from other, outdated apps, see also [this FAQ](#user-content-faq49)
 * Optional: *use fingerprint hardware* (USE_FINGERPRINT) and use *biometric hardware* (USE_BIOMETRIC): to use biometric authentication
-* Optional: *find accounts on the device* (GET_ACCOUNTS): to use [OAuth](https://en.wikipedia.org/wiki/OAuth) instead of passwords
+* Optional: *find accounts on the device* (GET_ACCOUNTS): to select an account when using the Gmail quick setup
-* Android 5.1 Lollipop and before: *use accounts on the device* (USE_CREDENTIALS): to use OAuth instead of passwords (not used/needed on later Android versions)
+* Android 5.1 Lollipop and before: *use accounts on the device* (USE_CREDENTIALS): to select an account when using the Gmail quick setup (not used/needed on later Android versions)
+
+[Optional permissions](https://developer.android.com/training/permissions/requesting) are supported on Android 6 Marshmallow and later only.
+On earlier Android versions you will be asked to grant the optional permissions on installing FairEmail.
 
 The following permissions are needed to show the count of unread messages as a badge (see also [this FAQ](#user-content-faq106)):