diff --git a/Cargo.toml b/Cargo.toml
index 8d23f96..1db0865 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,12 +3,13 @@ name = "bglga"
 version = "0.1.0"
 edition = "2021"
 
+[features]
+default = ["dev"]
+dev = ["bevy/debug", "bevy/track_location"]
+
 [dependencies]
 bevy = "0.18"
 fastrand = "2.0.1"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 dirs = "6"
-
-[dev-dependencies]
-bevy = { version = "0.18", features = ["debug"] }
diff --git a/README.md b/README.md
index f43b613..6cd7176 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,15 @@ The game features:
 nix develop --command cargo build
 ```
 
+The `dev` cargo feature is enabled by default and turns on `bevy/debug` and
+`bevy/track_location` so ECS panics (e.g. `B0001` query conflicts) report
+real type names and source locations. For a shipping release build, disable
+it:
+
+```
+nix develop --command cargo build --release --no-default-features
+```
+
 ## How to Test
 
 ```