diff --git a/0.5/index.bs b/0.5/index.bs
index ffc7cf57..6d5fbbb2 100644
--- a/0.5/index.bs
+++ b/0.5/index.bs
@@ -382,10 +382,20 @@ See the [OMERO WebGateway documentation](https://omero.readthedocs.io/en/stable/
 for more information.
 
 The "omero" metadata is optional, but if present it MUST contain the field "channels", which is an array of dictionaries describing the channels of the image.
-Each dictionary in "channels" MUST contain the field "color", which is a string of 6 hexadecimal digits specifying the color of the channel in RGB format.
-Each dictionary in "channels" MUST contain the field "window", which is a dictionary describing the windowing of the channel.
-The field "window" MUST contain the fields "min" and "max", which are the minimum and maximum values of the window, respectively.
-It MUST also contain the fields "start" and "end", which are the start and end values of the window, respectively.
+The "channels" array length SHOULD correspond to the size of the "c" axis.
+Each dictionary in "channels" MAY contain the following fields:
+
+- "color" (string) String of 6 hexadecimal digits specifying the color of the channel in RGB format.
+- "label" (string) Channel name.
+- "active" (boolean) Indicates whether the channel should be displayed.
+- "window" (dictionary) Values describing the windowing of the channel. All values are optional (MAY).
+  The "min" and "max" values may be used by viewers as the range of channel sliders.
+  All values can be floating-point numbers, but will likely be integers for integer pixel types.
+  - "min" (float) Should correspond to the minimum pixel intensity for that channel.
+  - "max" (float) Should correspond to the maximum pixel intensity for that channel.
+  - "start" (float) Start of the rendering window.
+  - "end" (float) End of the rendering window.
+- "inverted" (boolean) If true, the rendering of darkest to brightest pixels should be inverted.
 
 "labels" metadata {#labels-md}
 ------------------------------