diff --git a/PLUGINS.md b/PLUGINS.md
index e7f7488b..fae13d0d 100644
--- a/PLUGINS.md
+++ b/PLUGINS.md
@@ -566,6 +566,8 @@ Content of `state` (updated to the current journal entry):
 | `CargoJSON`    |           `dict`            | content of cargo.json as of last read.                                                                          |
 | `Credits`      |            `int`            | Current credits balance                                                                                         |
 | `FID`          |            `str`            | Frontier commander ID                                                                                           |
+| `Horizons`     |           `bool`            | From `LoadGame` event.                                                                                          |
+| `Odyssey`      |           `bool`            | From `LoadGame` event.  `False` if not present, else the event value.                                           |
 | `Loan`         |       `Optional[int]`       | Current loan amount, if any                                                                                     |
 | `Raw`          |           `dict`            | Current raw engineering materials                                                                               |
 | `Manufactured` |           `dict`            | Current manufactured engineering materials                                                                      |
@@ -631,6 +633,19 @@ the same when you're on-foot.
 `SuitCurrent`, `Suits`, `SuitLoadoutCurrent` & `SuitLoadouts` hold CAPI data
 relating to suits and their loadouts.
 
+New in version 5.0.1:
+
+`Odyssey` boolean based on the presence of such a flag in the `LoadGame` 
+event.  Defaults to `False`, i.e. if no such key in the event.
+
+The previously undocumented`Horizons` boolean is similarly from `LoadGame`, 
+but blindly retrieves the value rather than having a strict default.  There's
+be an exception if it wasn't there, and the value would be `None`.  Note that
+this is **NOT** the same as the return from
+[plugins/eddn.py:is_horizons()](./plugins/eddn.py). That function is necessary
+because CAPI data doesn't (didn't always?) have an indication of Horizons or
+not.
+
 ##### Synthetic Events
 
 A special "StartUp" entry is sent if EDMC is started while the game is already