Added additional info to "birthday set".

README.md

@@ -228,7 +228,7 @@ Command | Description | Example
 ------- | ----------- | -------
 `name set <new_name>` | Set your preferred name (max 64 characters). | `name set Hawk`
 `pronouns set <new_pronouns>` | Set your pronouns (max 64 characters). | `pronouns set She/Her`
-`birthday set <new_birthday>` | Set your birthday in one of the following formats: `1997-08-27`, `8 August 1997`, `Aug 8 1997`, `August 8`, `8 Aug`. You may omit your birth year with the month-name format. | `birthday set 1997-08-27`
+`birthday set <new_birthday>` | Set your birthday in one of the following formats: `1997-08-27`, `8 August 1997`, `Aug 8 1997`, `August 8`, `8 Aug`. You may omit your birth year with the month-name format (age will not be calculated). | `birthday set 1997-08-27`
 `timezone set <new_timezone>` | Set your timezone. Don't worry about formatting. Typing the name of the nearest major city should be good enough, but you can also try your state/country if that doesn't work. If you're confused, use this website to find your full timezone name: http://kevalbhatt.github.io/timezone-picker | `timezone set new york`
 
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