README.md in aixm-0.3.10 vs README.md in aixm-0.3.11

@@ -18,11 +18,11 @@
 ### Security
 
 This gem is [cryptographically signed](https://guides.rubygems.org/security/#using-gems) in order to assure it hasn't been tampered with. Unless already done, please add the author's public key as a trusted certificate now:
 
 ```
-gem cert --add <(curl -Ls https://raw.github.com/svoop/aixm/master/certs/svoop.pem)
+gem cert --add <(curl -Ls https://raw.github.com/svoop/aixm/main/certs/svoop.pem)
 ```
 
 ### Bundler
 
 Add the following to the <tt>Gemfile</tt> or <tt>gems.rb</tt> of your [Bundler](https://bundler.io) powered Ruby project:
@@ -98,22 +98,32 @@
 
 The `:ofmx` schema requires the [region to be set on all core features](https://gitlab.com/openflightmaps/ofmx/wikis/Features#core-features). You can do so on individual features, however, you might want to configure a default region to simplify your life:
 
 ```ruby
 AIXM.ofmx!
-AIXM.region = 'LF'
+AIXM.config.region = 'LF'
 ```
 
 :warning: This setting has no effect when using the `:aixm` schema.
 
+### AIXM.voice_channel_separation
+
+Define which voice channel separation should be used to validate voice communication frequencies.
+
+```ruby
+AIXM.voice_channel_separation = :any   # both 25 and 8.33 kHz (default)
+AIXM.voice_channel_separation = 25     # 25 kHz only
+AIXM.voice_channel_separation = 833    # 8.33 kHz only
+```
+
 ### AIXM.config.mid
 
 In order to insert [OFMX-compliant `mid` attributes](https://gitlab.com/openflightmaps/ofmx/wikis/Features#mid) into all `*Uid` elements, you have set the mid configuration option to `true`.
 
 ```ruby
 AIXM.ofmx!
-AIXM.config.mid          # => false - don't insert mid attributes by default
-AIXM.config.mid = true   # => true  - insert mid attributes
+AIXM.config.mid = false   # don't insert mid attributes (default)
+AIXM.config.mid = true    # insert mid attributes
 ```
 
 :warning: This setting has no effect when using the `:aixm` schema.
 
 ### AIXM.config.ignored_errors