diff --git a/CLAUDE.md b/CLAUDE.md
index 7033017..f3561c1 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -44,7 +44,7 @@ Toujours répondre en français à l'utilisateur. Code, commentaires de code, co
 | `MULTIHMR_SERVER_BACKEND` | `pyobjc` | server: `pyobjc` or `coremltools` |
 | `MULTIHMR_LOOP_FPS` | `30` | Python worker loop target_fps |
 | `AVBODY_HOST` | `127.0.0.1` | route TCP mesh + OSC to remote AVLiveBody |
-| `MEDIAPIPE_DELEGATE` | `cpu` | `gpu` Metal SRGBA (faster, flake on M5) |
+| `MEDIAPIPE_DELEGATE` | `gpu` | Metal SRGBA (faster); `cpu` fallback for stability |
 | `POSE_FILTER` | `median+kalman+lookahead+ik` | filter chain stages |
 | `MULTIHMR_REID` | `dino` | DINO cosine matching, `iou` fallback |
 
@@ -88,6 +88,9 @@ Toujours répondre en français à l'utilisateur. Code, commentaires de code, co
 | `HAND_NEAR_OFF` | `0.08` | hand size hysteresis off-threshold for gesture slot stabilizer |
 | `HAND_HOLD_FRAMES` | `2` | gesture slot: frames to hold last hand on Vision miss |
 | `ARKIT_BONE_MAX` | `0.5` | max ARKit body bone length in normalized units; longer bones are skipped (tracking-loss garbage filter) |
+| `PINCH_ENABLE` | `0` | enable pinch gesture detection |
+| `VIZ_HUD` | `0` | show debug HUD overlay |
+| `CONCERT_MIRROR` | `1` | mirror video horizontally (!=0 enables) |
 
 ## Conventions globales
 
diff --git a/data_only_viz/config.py b/data_only_viz/config.py
index f62af39..6a653d5 100644
--- a/data_only_viz/config.py
+++ b/data_only_viz/config.py
@@ -29,10 +29,10 @@ PINCH_RATIO_OFF             0.65      float  dist/size above which pinch re-arms
 PINCH_REFRACTORY_MS         250       float  min ms between pinches per finger
 PINCH_MARGIN                0.20      float  extra margin added to pinch zone
 PINCH_EXT_RATIO             1.35      float  extended-pinch activation ratio
-PINCH_EXT_MIN               2         int    min frames for extended-pinch debounce
+PINCH_EXT_MIN               2         int    min extended fingers for a pinch to fire; 0 disables open-hand gate
 PINCH_DEBOUNCE_FRAMES       3         int    debounce frames for pinch state machine
 HAND_CONF_MIN               0.45      float  min hand landmark confidence to render
-HAND_PERSIST_FRAMES         3         int    frames to persist hand after disappearance
+HAND_PERSIST_FRAMES         3         int    consecutive frames before a hand track is drawn; 1=off
 HAND_SWAP_LR                "0"       bool   Safety knob: invert Vision chirality (validated correct live 2026-07-02; keep 0 unless a future iPhone app build flips it)
 HAND_NEAR_MIN               0.10      float  min hand size (norm) to consider "near"
 HAND_PERSIST_GRACE          2         int    grace frames before dropping a hand track on Vision miss (0 = strict)