diff --git a/README.md b/README.md
index 37b366d..d45fa28 100644
--- a/README.md
+++ b/README.md
@@ -21,22 +21,24 @@ A 1v1 async multiplayer 2D curling game for mobile browser.
    npm run dev
    # opens on 0.0.0.0:5173 by default
    ```
-4. Open two browser tabs to the same room URL, e.g.:
+4. Open one or more browser tabs to the same room URL, e.g.:
    ```
    http://localhost:5173/?room=DEMO1
    ```
-   The first tab waits; the second starts the match. Use the *Copy share link* button to invite an opponent.
+   Use the team dropdown in the top-right to switch between Red and Yellow — this enables local pass-and-play on one device. Use the *Copy share link* button to invite an opponent on another device.
 
 ### Mobile devices
 
-The frontend binds to `0.0.0.0` via `--host`. Find your machine's LAN IP and open `http://<ip>:5173/?room=CODE` on the phone. Both devices must be on the same Wi-Fi and able to reach the backend on port `3000`.
+The frontend binds to `0.0.0.0` via `--host`. Find your machine's LAN IP and open `http://<ip>:5173/?room=CODE` on the phone. Both devices must be on the same Wi-Fi and able to reach the backend on port `3000`. The default view is zoomed in on the house; drag the sheet vertically to scroll up to the hog line.
 
 ### Controls
 
 - Drag inside the house to place the broom (aim point).
-- Tap a weight `1`–`10`.
+- Use the team dropdown to choose which team's stone you are throwing.
+- Use the left/right arrow buttons to select curl; the arrow points the direction the stone will curve.
 - Tap **THROW**.
-- The server runs the physics and streams the trajectory; the frontend interpolates the animation.
+- The server runs the physics for every stone and streams their paths; the frontend interpolates the animation, so collisions animate smoothly for all stones.
+- Drag anywhere outside the house (or when it's not your turn) to scroll up toward the hog line.
 
 ### Architecture
 
@@ -54,6 +56,7 @@ cd e2e
 npm install -g ws   # or npm install ws locally in the project
 node e2e_test.cjs   # room lifecycle, throw, trajectory, out-of-play removal
 node e2e_score.cjs  # stones remain in play and alternate turns
+node collision_trajectory_qa.cjs  # verifies every stone gets a trajectory during a collision
 ```
 
 ### Limitations / known simplifications