README.md in pwm-1.1.1 vs README.md in pwm-1.2.0

@@ -6,15 +6,19 @@
 Passwords are chosen from the set of all upper-case letters except I and
 O, all lower-case letters except l, and the digits 2 through 9. 0 and O
 are not used to avoid confusion with each other. I, l, and 1 are not
 used for the same reason.
 
+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)
 
-The default length is 16.
+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