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--- a/HOWTO.md
+++ b/HOWTO.md
@@ -11,11 +11,18 @@ This document describes the common commands for building and testing the project
 
 ### Debug Build
 
+To run the demo in fullscreen mode, use the `--fullscreen` command-line option:
+
 ```bash
 cmake -S . -B build
 cmake --build build
+./build/demo64k --fullscreen
 ```
 
+Keyboard Controls:
+*   `Esc`: Exit the demo.
+*   `F`: Toggle fullscreen mode.
+
 ### Size-Optimized Build
 
 ```bash