Document the size of the terminal window

diff --git a/README.md b/README.md
index 3336970be0a308b2870005dc809176f1bad1612c..718d2faf4dea1f0f5e48ae75e74b29ea0aa029d1 100644 (file)
--- a/README.md
+++ b/README.md
@@ -49,6 +49,8 @@ Then compile and run all the software components:
    Numbers are cards of different users, letters A through F are
    different coffee machine buttons.
 
+The size of the terminal window is 960×560 px.
+
 ### Submitting patches
 
 Send patches by email (preferably with [git send-email][]) to