diff --git a/docs/protocol-schema/core-types.md b/docs/protocol-schema/core-types.md
index 37c2f1348..3b61a6687 100644
--- a/docs/protocol-schema/core-types.md
+++ b/docs/protocol-schema/core-types.md
@@ -85,7 +85,7 @@ it's location in latitude, longitude, form.
 | Name          | Type              | Description                                                  |
 | ------------- | ----------------- | ------------------------------------------------------------ |
 | `timestamp`   | `float`           | The vehicle/log transmission_time associated with this data. |
-| `map_origin`  | `map_origin`      | Uniquely identifies an object for all time.                  |
+| `map_origin`  | `map_origin`      | Geographic coordinates used by basemap.                      |
 | `position`    | `array<float>(3)` | x, y, z position in meters                                   |
 | `orientation` | `array<float>(3)` | roll, pitch, yaw angle in radians                            |