diff --git a/src/SUMMARY.md b/src/SUMMARY.md
index 261769e3..29dc5fe6 100644
--- a/src/SUMMARY.md
+++ b/src/SUMMARY.md
@@ -29,8 +29,9 @@
   - [HashMap](std/hashmaps.md)
   - [Strings](std/strings.md)
   - [Smart pointers](std/smart_pointers.md)
-  - [Regex](std/regex.md)
-  - [Serialization (Serde)](std/serialization.md)
+  - [Key crates](std/key_crates.md)
+    - [Regex](std/regex.md)
+    - [Serialization (Serde)](std/serialization.md)
 
 - [Cross-cutting concerns](concerns/cross_cutting_concerns.md)
   - [Automatic derivation](concerns/derive.md)
@@ -97,7 +98,6 @@
 - [Links](links/links.md)
   - [Example code](links/example_code.md)
   - [Cheat sheets](links/rust_cheatsheets.md)
-  - [Essential crates](links/essential_crates.md)
   - [Blogs](links/blogs.md)
   - [Books](links/books.md)
   - [Companies](links/companies.md)
diff --git a/src/intro.md b/src/intro.md
index a35456d9..9bd85111 100644
--- a/src/intro.md
+++ b/src/intro.md
@@ -34,7 +34,7 @@ This book is in its **early days** - feel free to submit an issue or a pull requ
 
 Contributions, from small edits to whole chapters, are most welcome. Draft pages are kept in [this folder][drafts]. An informal (and very long) list of topics of interest is kept in [TODO][todo]. Embedded examples should be ideally _runnable_ on the [Rust playground][rust-playground]⮳ or at least directly copy-pasteable into Rust code. Please read [CONTRIBUTING.md][contributing] for more details.
 
-Its long-term goal is the coverage of the 'most commonly used' Rust crates, as defined by [blessed.rs][blessed-rs]⮳, the most downloaded libraries in [crates.io][crates-io]⮳, and 'high quality crates' per [lib.rs][lib-rs]⮳ [statistics][lib-rs-stats]⮳. Review [essential crates](links/essential_crates.md) for topic ideas.
+Its long-term goal is the coverage of the 'most commonly used' Rust crates, as defined by [blessed.rs][blessed-rs]⮳, the most downloaded libraries in [crates.io][crates-io]⮳, and 'high quality crates' per [lib.rs][lib-rs]⮳ [statistics][lib-rs-stats]⮳. Review [key crates](std/key_crates.md) for topic ideas.
 
 This site is not affiliated with the [Rust Foundation][rust-foundation]⮳.
 
diff --git a/src/links/essential_crates.md b/src/std/key_crates.md
similarity index 69%
rename from src/links/essential_crates.md
rename to src/std/key_crates.md
index a74dbf27..c7beeead 100644
--- a/src/links/essential_crates.md
+++ b/src/std/key_crates.md
@@ -1,6 +1,6 @@
-# Essential crates
+# Key crates
 
-Consult the following web sites for crate recommendations:
+Consult the following sites for crate recommendations:
 
 - [Blessed.rs][blessed-rs]⮳
 - [lib.rs][lib-rs]⮳
@@ -8,6 +8,11 @@ Consult the following web sites for crate recommendations:
 - The Rust community’s official crate registry: [crates.io][crates-io]⮳
 - [Crates.io's most (recent) downloads][most-recent-downloads]⮳
 
+## In this section
+
+- [Regex](regex.md)
+- [Serialization (Serde)](serialization.md)
+
 ## Older resources
 
 - [Rust starter pack][rust-starter-pack]⮳