diff --git a/allensdk/core/brain_observatory_cache.py b/allensdk/core/brain_observatory_cache.py
index 3d66ae615..9c80c0630 100644
--- a/allensdk/core/brain_observatory_cache.py
+++ b/allensdk/core/brain_observatory_cache.py
@@ -654,9 +654,19 @@ def get_eye_tracking(self, ophys_experiment_id) -> np.ndarray:
         Returns
         -------
         `numpy.ndarray`
-            Contents of array unknown. Assumed to be [n_frames, 5] where
-            the meaning of the values in each column are unknown.
-            Ask Saskia De Vries saskiad@alleninstitute.org
+            Shape of array is (n_frames, 5); axis=1 stores the following:
+                [:, 0] is the 2-photon frame number. Can be parsed as int and
+                    used to index calcium imaging dF/F arrays, for example.
+                [:, 1] is the computed eye area in cm^2
+                [:, 2] is the pupil area in cm^2
+                [:, 3] is the x (azimuth) position of the pupil in degrees
+                [:, 4] is the y (altitude) position of the pupil in degrees
+            Metrics are computed using DeepLabCut (Mathis et al., 2018, Nature)
+            from videos of the mouse's eye during experimentation.
+            See King et al., 2023, eNeuro, and de Vries et al., 2018, Nature
+            for more info on eye tracking methods.
+            Contact saskiad@alleninstitute.org, chase.king@alleninstitute.org
+            with any questions.
         """
         cloud_cache = S3CloudCache(
             cache_dir=Path(self.manifest_path).parent / "s3_cache",