diff --git a/website/src/content/docs/docs/language-basics/built-in-types.md b/website/src/content/docs/docs/language-basics/built-in-types.md
index 380c4071fdb..575d9ea7dc1 100644
--- a/website/src/content/docs/docs/language-basics/built-in-types.md
+++ b/website/src/content/docs/docs/language-basics/built-in-types.md
@@ -39,9 +39,11 @@ Built in types are related to each other according to the rules described in [ty
 | `plainDate`      | A date on a calendar without a time zone, e.g. "April 10th"                         |
 | `plainTime`      | A time on a clock without a time zone, e.g. "3:00 am"                               |
 | `utcDateTime`    | A date and time in coordinated universal time (UTC), e.g. "1985-04-12T23:20:50.52Z" |
-| `offsetDateTime` | A date and time in a particular time zone, e.g. "April 10th at 3:00am in PST"       |
+| `offsetDateTime` | A date and time in a particular time zone, e.g. "1985-04-12T16:20:50-08:00"         |
 | `duration`       | A duration/time period. e.g 5s, 10h                                                 |
 
+For more information about how emitters should encode date-time strings, read [Encoding of types](https://typespec.io/docs/libraries/http/encoding/#utcdatetime-and-offsetdatetime) in the HTTP library.
+
 ## Other core types
 
 | Type              | Description                                                                                                                                                |