diff --git a/src/error-handling/converting-error-types.md b/src/error-handling/converting-error-types.md
index 2605b991..03e5ba07 100644
--- a/src/error-handling/converting-error-types.md
+++ b/src/error-handling/converting-error-types.md
@@ -49,3 +49,12 @@ fn main() {
     println!("username or error: {username:?}");
 }
 ```
+
+<details>
+
+Key points:
+
+* The `username` variable can be either `Ok(string)` or `Err(error)`.
+* Use the `fs::write` call to test out the different scenarios: no file, empty file, file with username.
+
+</details>
diff --git a/src/error-handling/try-operator.md b/src/error-handling/try-operator.md
index 82e58254..02ad6d15 100644
--- a/src/error-handling/try-operator.md
+++ b/src/error-handling/try-operator.md
@@ -44,3 +44,12 @@ fn main() {
     println!("username or error: {username:?}");
 }
 ```
+
+<details>
+
+Key points:
+
+* The `username` variable can be either `Ok(string)` or `Err(error)`.
+* Use the `fs::write` call to test out the different scenarios: no file, empty file, file with username.
+
+</details>