Mostly editorial review.

1 files changed, 11 insertions, 6 deletions

diff --git a/book/en/src/by-example/app_init.md b/book/en/src/by-example/app_init.md
index 22c4a28..5bf6200 100644
--- a/book/en/src/by-example/app_init.md
+++ b/book/en/src/by-example/app_init.md
@@ -1,13 +1,18 @@
 # App initialization and the `#[init]` task
 
 An RTIC application requires an `init` task setting up the system. The corresponding `init` function must have the
-signature `fn(init::Context) -> (Shared, Local, init::Monotonics)`, where `Shared` and `Local` are the resource
+signature `fn(init::Context) -> (Shared, Local, init::Monotonics)`, where `Shared` and `Local` are resource
 structures defined by the user.
 
-The `init` task executes after system reset (after the optionally defined `pre-init` and internal RTIC
-initialization). The `init` task runs *with interrupts disabled* and has exclusive access to Cortex-M (the
-`bare_metal::CriticalSection` token is available as `cs`) while device specific peripherals are available through
-the `core` and `device` fields of `init::Context`.
+The `init` task executes after system reset, [after an optionally defined `pre-init` code section][pre-init] and an always occurring internal RTIC
+initialization.
+
+[pre-init]: https://docs.rs/cortex-m-rt/latest/cortex_m_rt/attr.pre_init.html
+
+The `init` and optional `pre-init` tasks runs *with interrupts disabled* and have exclusive access to Cortex-M (the
+`bare_metal::CriticalSection` token is available as `cs`).
+
+Device specific peripherals are available through the `core` and `device` fields of `init::Context`.
 
 ## Example
 
@@ -15,7 +20,7 @@ The example below shows the types of the `core`, `device` and `cs` fields, and s
 variable with `'static` lifetime.
 Such variables can be delegated from the `init` task to other tasks of the RTIC application.
 
-The `device` field is available when the `peripherals` argument is set to the default value `true`.
+The `device` field is only available when the `peripherals` argument is set to the default value `true`.
 In the rare case you want to implement an ultra-slim application you can explicitly set `peripherals` to `false`.
 
 ``` rust