diff --git a/src/exercises/day-4/dining-philosophers.md b/src/exercises/day-4/dining-philosophers.md
index 04387b36..9b864b5a 100644
--- a/src/exercises/day-4/dining-philosophers.md
+++ b/src/exercises/day-4/dining-philosophers.md
@@ -11,8 +11,10 @@ The dining philosophers problem is a classic problem in concurrency:
 > an individual philosopher finishes eating, they will put down both forks.
 
 You will need a local [Cargo installation](../../cargo/running-locally.md) for
-this exercise. Copy the code below to `src/main.rs` file, fill out the blanks,
-and test that `cargo run` does not deadlock:
+this exercise. Copy the code below to a file called `src/main.rs`, fill out the
+blanks, and test that `cargo run` does not deadlock:
+
+<!-- File src/main.rs -->
 
 ```rust,compile_fail
 {{#include dining-philosophers.rs:Philosopher}}
@@ -35,3 +37,14 @@ and test that `cargo run` does not deadlock:
     // Output their thoughts
 }
 ```
+
+You can use the following `Cargo.toml`:
+
+<!-- File Cargo.toml -->
+
+```toml
+[package]
+name = "dining-philosophers"
+version = "0.1.0"
+edition = "2021"
+```
diff --git a/src/exercises/day-4/link-checker.md b/src/exercises/day-4/link-checker.md
index 9922c909..e4c50622 100644
--- a/src/exercises/day-4/link-checker.md
+++ b/src/exercises/day-4/link-checker.md
@@ -32,7 +32,14 @@ $ cargo add thiserror
 
 The `cargo add` calls will update the `Cargo.toml` file to look like this:
 
+<!-- File Cargo.toml -->
+
 ```toml
+[package]
+name = "link-checker"
+version = "0.1.0"
+edition = "2021"
+
 [dependencies]
 reqwest = { version = "0.11.12", features = ["blocking", "rustls-tls"] }
 scraper = "0.13.0"
@@ -44,6 +51,8 @@ You can now download the start page. Try with a small site such as
 
 Your `src/main.rs` file should look something like this:
 
+<!-- File src/main.rs -->
+
 ```rust,compile_fail
 {{#include link-checker.rs:setup}}