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-# tidepool-keyboard-demo
+# Tidepool Keyboard Demo
 
-An accessible tiny browser demo for exploring a tidepool
\ No newline at end of file
+A dependency-free browser demo for moving an explorer between tidepool zones.
+
+## Keyboard controls
+
+- ArrowRight and ArrowDown move to the next zone.
+- ArrowLeft and ArrowUp move to the previous zone.
+- Movement wraps at both ends.
+
+## Review checklist
+
+- Confirm every action has a visible keyboard focus state.
+- Confirm the active zone is announced in a live region.
+- Confirm wraparound behavior is understandable without a pointer.