diff --git a/README.md b/README.md
index 3b531952..07a78e2c 100644
--- a/README.md
+++ b/README.md
@@ -125,7 +125,7 @@ Application behavior can be changed by configuring the following environment var
 #### Visual
 
 - `NEXT_PUBLIC_DEFAULT_THEME = light | dark` sets preferred initial theme (defaults to `system` when not configured)
-- `NEXT_PUBLIC_MATTE_PHOTOS = 1` constrains the size of each photo, and displays a surrounding border (potentially useful for photos with tall aspect ratios)
+- `NEXT_PUBLIC_MATTE_PHOTOS = 1` constrains the size of each photo, and displays a surrounding border, potentially useful for photos with tall aspect ratios (colors can be customized via `NEXT_PUBLIC_MATTE_COLOR` + `NEXT_PUBLIC_MATTE_COLOR_DARK`)
 
 #### Display
 - `NEXT_PUBLIC_CATEGORY_VISIBILITY`