diff --git a/crates/stackchan-firmware/Cargo.toml b/crates/stackchan-firmware/Cargo.toml
index c9e4c8f..d8bd0f5 100644
--- a/crates/stackchan-firmware/Cargo.toml
+++ b/crates/stackchan-firmware/Cargo.toml
@@ -107,10 +107,12 @@ esp-alloc = { version = "0.9.0", features = ["defmt"] }
 # esp-hal ~1.1.0-rc.0 which would force a wider toolchain bump.
 # `unstable` is required because esp-hal itself runs with `unstable`
 # enabled here. `ble` enables the on-chip BLE controller (HCI behind
-# the `BleConnector` Transport); `coex` lets Wi-Fi STA and BLE share
-# the radio at the cost of ~10–15% Wi-Fi throughput. The bt-hci
-# version pin (^0.6) cascades into the trouble-host 0.5.x line.
-esp-radio = { version = "~0.17", features = ["defmt", "esp32s3", "wifi", "ble", "coex", "esp-now", "unstable"] }
+# the `BleConnector` Transport). No `coex`: BLE and Wi-Fi are brought up
+# mutually exclusively in firmware (BLE only when no Wi-Fi SSID is set),
+# so the radio is never shared — coexistence would only cost the internal
+# RAM the Wi-Fi MAC needs to start. The bt-hci version pin (^0.6) cascades
+# into the trouble-host 0.5.x line.
+esp-radio = { version = "~0.17", features = ["defmt", "esp32s3", "wifi", "ble", "esp-now", "unstable"] }
 # BLE host stack. 0.5.1 is the trouble-host release pinned to
 # `bt-hci ^0.6` (matches esp-radio 0.17). 0.6.0 jumps to `bt-hci 0.8`
 # and pairs with esp-radio 0.18 — bump together when we move the
diff --git a/crates/stackchan-firmware/src/ble/mod.rs b/crates/stackchan-firmware/src/ble/mod.rs
index 57ccfe8..7a96738 100644
--- a/crates/stackchan-firmware/src/ble/mod.rs
+++ b/crates/stackchan-firmware/src/ble/mod.rs
@@ -37,10 +37,10 @@
 //! LCD. Bonds are persisted to the SD card via [`bonds`] so a
 //! re-paired peer skips the passkey dance.
 //!
-//! Coexistence: BLE rides the same radio as Wi-Fi via esp-radio's
-//! `coex` feature. Expect a single-digit-percent Wi-Fi throughput
-//! cost — invisible for the dashboard / SSE / settings round-trips
-//! the firmware does today.
+//! Mutually exclusive with Wi-Fi: BLE is brought up only when no Wi-Fi
+//! SSID is configured (see `main.rs`). The two never share the radio, so
+//! esp-radio's `coex` feature is left off — enabling it would only reserve
+//! internal RAM the Wi-Fi MAC needs to start.
 //!
 //! Sync-version note: trouble-host 0.5.x pulls
 //! `embassy-sync = 0.6` while the rest of the firmware uses 0.7.