README.md in ezid-client-0.9.0 vs README.md in ezid-client-0.9.1

@@ -40,17 +40,25 @@
 => "http://ezid.cdlib.org/id/ark:/99999/fk4rx9d523"
 ```
 
 A default shoulder can be configured:
 
+- By environment variable (added in v0.9.1):
+
+```sh
+export EZID_DEFAULT_SHOULDER="ark:/99999/fk4"
+```
+
+- By client configuration:
+
 ```ruby
 Ezid::Client.configure do |config|
   config.default_shoulder = "ark:/99999/fk4"
 end
 ```
 
-Then identifiers can minted on the default shoulder:
+New identifiers will then be minted on the default shoulder when a shoulder is not specified:
 
 ```ruby
 >> identifier = Ezid::Identifier.create
 I, [2014-12-09T11:22:34.499860 #32279]  INFO -- : EZID MINT ark:/99999/fk4 -- success: ark:/99999/fk43f4wd4v
 I, [2014-12-09T11:22:35.317181 #32279]  INFO -- : EZID GET ark:/99999/fk43f4wd4v -- success: ark:/99999/fk43f4wd4v
@@ -136,12 +144,17 @@
 
 ## Authentication
 
 Credentials can be provided in any -- or a combination -- of these ways:
 
-- Environment variables `EZID_USER` and/or `EZID_PASSWORD`;
+- Environment variables:
 
+```sh
+export EZID_USER="eziduser"
+export EZID_PASSWORD="ezidpass"
+```
+
 - Client configuration:
 
 ```ruby
 Ezid::Client.configure do |config|
   config.user = "eziduser"
@@ -155,12 +168,17 @@
 client = Ezid::Client.new(user: "eziduser", password: "ezidpass")
 ```
 
 ## Alternate Host and Disabling SSL
 
-By default Ezid::Client connects over SSL to the EZID host at [ezid.cdlib.org](http://ezid.cdlib.org), but the host and SSL settings may be overridden:
+By default `Ezid::Client` connects over SSL to the EZID host at [ezid.cdlib.org](http://ezid.cdlib.org), but the host and SSL settings may be overridden:
 
-- By setting the `EZID_HOST` environment variable; `EZID_USE_SSL` may be set to the string "false" to disable SSL for all requests.
+- By environment variables:
+
+```sh
+export EZID_HOST="localhost"
+export EZID_USE_SSL="false" # "false" disables SSL for all requests
+```
 
 - Client configuration:
 
 ```ruby
 Ezid::Client.configure do |config|