clarify detection variable definitions

README.md

@@ -181,11 +181,11 @@ Annotations were created to evaluate the [kabr-tools pipeline](https://github.co
 | `/annotations/version`           | string            | `1.1`         | Annotation file (XML) version. |
 | `/annotations/track@id`          | integer           | `0`           | Unique id for a tracked object _within_ the video. |
 | `/annotations/track@label`       | string            | `Grevy`       | Class/species label. |
-| `/annotations/track@source`      | string            | `manual`      | How the annotation was created. |
+| `/annotations/track@source`      | string            | `manual`      | How the annotation was created. These are all `manual`. |
 | `/annotations/track/box@frame`   | int (0-based)     | `0,1,2,…`     | Frame index. |
 | `/annotations/track/box@outside` | enum {`0`,`1`}    | `0`           | `0` present; `1` not visible. |
-| `/annotations/track/box@occluded`| enum {`0`,`1`}    | `0`           | Occlusion flag. |
-| `/annotations/track/box@keyframe`| enum {`0`,`1`}    | `1`           | Keyframe marker. |
+| `/annotations/track/box@occluded`| enum {`0`,`1`}    | `0`           | Occlusion flag (`1` indicates the subject is occluded). |
+| `/annotations/track/box@keyframe`| enum {`0`,`1`}    | `1`           | Keyframe marker. Every 10th frame is considered a "keyframe" (CVAT default setting). |
 | `/annotations/track/box@xtl`     | float (px)        | `2342.00`     | X coordinate of top-left corner. |
 | `/annotations/track/box@ytl`     | float (px)        | `2427.00`     | Y coordinate of top-left corner. |
 | `/annotations/track/box@xbr`     | float (px)        | `2530.00`     | X coordinate of bottom-right corner. |
@@ -209,7 +209,7 @@ Annotations were created to evaluate the [kabr-tools pipeline](https://github.co
 | `end_frame` | `1450` | Last frame of the segment (if provided). |
 | `start_time` | `00:00:41.2` | Segment start time (if provided). |
 | `end_time` | `00:00:48.8` | Segment end time (if provided). |
-| `species` | `Grevy` | Species label (if propagated/available). Only three potential labels: `Grevy`, `plains`, or `giraffe`. |
+| `species` | `Grevy` | Species label (if propagated/available). Only three potential labels: `Grevy`, `Plain Zebra`, or `Giraffe`. |
 | `notes` | `—` | Free-text notes or flags (optional). |
 | `model` | `x3d` | Model identifier used to label. |
 | `model_version` | `x3d_m` | Specific checkpoint/version tag (optional). |