diff --git a/README.md b/README.md
index 0d6aaf9..2f60640 100644
--- a/README.md
+++ b/README.md
@@ -40,8 +40,8 @@ The fields in the table below can be used in these parts of STAC documents:
 
 | Field Name             | Type   | Description                                                                                                                                                        |
 | ---------------------- | ------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
-| eo:cloud_cover         | number | Estimate of cloud cover                                                                                                                                            |
-| eo:snow_cover          | number | Estimate of snow and ice cover                                                                                                                                     |
+| eo:cloud_cover         | number | Estimate of cloud cover, in %.                                                                                                                                     |
+| eo:snow_cover          | number | Estimate of snow and ice cover, in %.                                                                                                                              |
 | eo:common_name         | string | The name commonly used to refer to the band to make it easier to search for bands across instruments. See the [list of accepted common names](#common-band-names). |
 | eo:center_wavelength   | number | The center wavelength of the band, in micrometers (μm).                                                                                                            |
 | eo:full_width_half_max | number | Full width at half maximum (FWHM). The width of the band, as measured at half the maximum transmission, in micrometers (μm).                                       |