README.md in pwm-1.2.0 vs README.md in pwm-1.2.1

@@ -11,23 +11,37 @@
 Starting with version 1.1.0, passwords are guaranteed to contain at
 least one upper-case letter, one lower-case letter, and one number.
 
 ## Usage
 
-    require 'pwm'
-    Pwm.password(length)
+```ruby
+require 'pwm'
+Pwm.password(length)
+```
 
 The default length is 16. The minimum length is 8. Specifying a length
 less than 8 will raise `Pwm::TooShortException`.
 
 You can also call pwm from the command line:
 
-    $ pwm # default 16 character password
-    $ pwm 12 # some other length
+```bash
+$ pwm
+h6ECtbDZPnRddHV7
+$ echo $?
+0
+$ pwm 8
+XdWod8f8
+$ echo $?
+0
+$ pwm 4
+length must be >= 8
+$ echo $?
+1
+```
 
 ## Author
 
-Mark Cornick <[e-mail]>
+Mark Cornick <[e-mail]>
 
 ## (Lack of) Copyright
 
 To the extent possible under law, Mark Cornick has waived all copyright
 and related or neighboring rights to pwm.