diff --git a/.cargo/config b/.cargo/config.toml
similarity index 60%
rename from .cargo/config
rename to .cargo/config.toml
index fa95820..64c93b1 100644
--- a/.cargo/config
+++ b/.cargo/config.toml
@@ -7,11 +7,3 @@ rustflags = [
 
 [build]
 target = "riscv32imac-unknown-none-elf"
-
-[profile.release]
-opt-level = "z"  # Optimize for size.
-codegen-units = 1
-lto = true
-
-[profile.dev]
-opt-level = "z"  # Optimize for size.
diff --git a/Cargo.toml b/Cargo.toml
index 97f80d9..6500fd0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -44,3 +44,10 @@ required-features = ["lcd"]
 name = "sdcard_test"
 required-features = ["sdcard"]
 
+[profile.release]
+opt-level = "z"  # Optimize for size.
+codegen-units = 1
+lto = true
+
+[profile.dev]
+opt-level = "z"  # Optimize for size.
diff --git a/README.md b/README.md
index c875575..8ed3278 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@ sudo apt-get install gcc-riscv64-unknown-elf
 
 ### Building 
 
-If you have a GD32VF103C**B** chip on your board, edit `.cargo/config` and replace
+If you have a GD32VF103C**B** chip on your board, edit `.cargo/config.toml` and replace
 `memory-c8.x` with `memory-cb.x`.
 
 To build all the provided examples run 
@@ -181,7 +181,7 @@ To flash the firmware, execute `load` in GDB:
 ```
 
 To improve your workflow, you can put the aforementioned GDB commands in
-a `debug.gdb` file and add these lines to `.cargo/config`:
+a `debug.gdb` file and add these lines to `.cargo/config.toml`:
 
 ```
 [target.riscv32imac-unknown-none-elf]