diff --git a/desktop/README.md b/desktop/README.md
index 71dc30ea..f94cd0b1 100644
--- a/desktop/README.md
+++ b/desktop/README.md
@@ -68,6 +68,7 @@ pip install pyserial pygame
 | `G`       | Set background to **gray**      |
 | `B`       | Set background to **blue**      |
 | `O`       | Set background to **orange**    |
+| `W`       | Set background to **white**     |
 | `I`       | Toggle **video inversion**      |
 | `P`       | Toggle **LCD pixel mode**       |
 | `SPACE`   | Save a screenshot as PNG        |
diff --git a/desktop/k5viewer.py b/desktop/k5viewer.py
index 466d48b9..0d36d2ab 100755
--- a/desktop/k5viewer.py
+++ b/desktop/k5viewer.py
@@ -37,6 +37,7 @@ COLOR_SETS = {  # {key: (name, foreground, background)}
     "g": ("Grey", pygame.Color(0, 0, 0), pygame.Color(202, 202, 202)),
     "o": ("Orange", pygame.Color(0, 0, 0), pygame.Color(255, 193, 37)),
     "b": ("Blue", pygame.Color(0, 0, 0), pygame.Color(28, 134, 228)),
+    "w": ("White", pygame.Color(0, 0, 0), pygame.Color(255, 255, 255)),
 }
 
 DEFAULT_COLOR = "g"  # Must be a key of "COLOR_SETS"