diff --git a/.cargo/config b/.cargo/config.toml
similarity index 100%
rename from .cargo/config
rename to .cargo/config.toml
diff --git a/book/en/src/by-example.md b/book/en/src/by-example.md
index 3a523e51bb..419a4bae64 100644
--- a/book/en/src/by-example.md
+++ b/book/en/src/by-example.md
@@ -30,3 +30,9 @@ Yields this output:
 ``` console
 {{#include ../../../ci/expected/locals.run}}
 ```
+
+> **NOTE**: You can choose target device by passing a target
+> triple to cargo (e.g. `cargo run --example init --target thumbv7m-none-eabi`) or
+> configure a default target in `.cargo/config.toml`.
+>
+> For running the examples, we use a Cortex M3 emulated in QEMU, so the target is `thumbv7m-none-eabi`.
\ No newline at end of file
diff --git a/book/en/src/by-example/app_init.md b/book/en/src/by-example/app_init.md
index 615c299102..22c4a28ade 100644
--- a/book/en/src/by-example/app_init.md
+++ b/book/en/src/by-example/app_init.md
@@ -28,9 +28,3 @@ Running the example will print `init` to the console and then exit the QEMU proc
 $ cargo run --target thumbv7m-none-eabi --example init
 {{#include ../../../../ci/expected/init.run}}
 ```
-
-> **NOTE**: You can choose target device by passing a target
-> triple to cargo (e.g. `cargo run --example init --target thumbv7m-none-eabi`) or
-> configure a default target in `.cargo/config.toml`.
->
-> For running the examples, we use a Cortex M3 emulated in QEMU, so the target is `thumbv7m-none-eabi`.