1 files changed, 2 insertions, 0 deletions

diff --git a/README.md b/README.md
index 71efc9e..ba3e260 100644
--- a/README.md
+++ b/README.md
@@ -153,6 +153,8 @@ grid or the screen changes.
 
 ## Writing a widget
 
+`DESIGN.md` is the visual identity every card follows; read it first.
+
 A widget module exports one function, `draw(cr, rect, colors)`. `lib/card.lua`
 carries the primitives it should use rather than reaching for Cairo directly: