diff --git a/shared-bindings/displayio/TileGrid.c b/shared-bindings/displayio/TileGrid.c
index 4cecd0f0f1..2b2526cd84 100644
--- a/shared-bindings/displayio/TileGrid.c
+++ b/shared-bindings/displayio/TileGrid.c
@@ -53,6 +53,8 @@
 //|         convert the value and its location to a display native pixel color. This may be a simple color
 //|         palette lookup, a gradient, a pattern or a color transformer.
 //|
+//|         To save RAM usage, tile values are only allowed in the range from 0 to 255 inclusive (single byte values).
+//|
 //|         tile_width and tile_height match the height of the bitmap by default.
 //|
 //|         :param Bitmap,OnDiskBitmap,Shape bitmap: The bitmap storing one or more tiles.