diff --git a/src/why-rust/modern.md b/src/why-rust/modern.md
index 05b6df5b..2ed58096 100644
--- a/src/why-rust/modern.md
+++ b/src/why-rust/modern.md
@@ -13,3 +13,39 @@ Rust is built with all the experience gained in the last 40 years.
 * Great compiler errors.
 * Built-in dependency manager.
 * Built-in support for testing.
+
+<details>
+
+Key points:
+
+* Remind people to read the errors --- many developers have gotten used to
+  ignore lengthly compiler output. The Rust compiler is significantly more
+  talkative than other compilers. It will often provide you with _actionable_
+  feedback, ready to copy-paste into your code.
+
+* The Rust standard library is small compared to languages like Java, Python,
+  and Go. Rust does not come with several things you might consider standard and
+  essential:
+
+  * a random number generator, but see [rand].
+  * support for SSL or TLS, but see [rusttls].
+  * support for JSON, but see [serde_json].
+
+  The reasoning behind this is that functionality in the standard library cannot
+  go away, so it has to be very stable. For the examples above, the Rust
+  community is still working on finding the best solution --- and perhaps there
+  isn't a single "best solution" for some of these things.
+
+  Rust comes with a built-in package manager in the form of Cargo and this makes
+  it trivial to download and compile third-party crates. A consequence of this
+  is that the standard library can be smaller.
+
+  Discovering good third-party crates can be a problem. Sites like
+  <https://lib.rs/> help with this by letting you compare health metrics for
+  crates to find a good and trusted one.
+
+[rand]: https://docs.rs/rand/
+[rusttls]: https://docs.rs/rustls/
+[serde_json]: https://docs.rs/serde_json/
+
+</details>