diff --git a/Cargo.lock b/Cargo.lock
index 0fbbeceb..475fb147 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1271,6 +1271,7 @@ dependencies = [
  "ignore",
  "log",
  "mdbook-core",
+ "mdbook-summary",
  "memchr",
  "notify",
  "notify-debouncer-mini",
@@ -1336,6 +1337,13 @@ dependencies = [
 [[package]]
 name = "mdbook-summary"
 version = "0.5.0-alpha.1"
+dependencies = [
+ "anyhow",
+ "log",
+ "memchr",
+ "pulldown-cmark 0.10.3",
+ "serde",
+]
 
 [[package]]
 name = "memchr"
diff --git a/Cargo.toml b/Cargo.toml
index 9db4957b..16858e37 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -25,6 +25,7 @@ anyhow = "1.0.98"
 log = "0.4.27"
 mdbook-core = { path = "crates/mdbook-core" }
 mdbook-summary = { path = "crates/mdbook-summary" }
+memchr = "2.7.5"
 pulldown-cmark = { version = "0.10.3", default-features = false, features = ["html"] } # Do not update, part of the public api.
 regex = "1.11.1"
 serde = { version = "1.0.219", features = ["derive"] }
@@ -60,7 +61,8 @@ handlebars = "6.0"
 hex = "0.4.3"
 log.workspace = true
 mdbook-core.workspace = true
-memchr = "2.5.0"
+mdbook-summary.workspace = true
+memchr.workspace = true
 opener = "0.8.1"
 pulldown-cmark.workspace = true
 regex.workspace = true
diff --git a/crates/mdbook-summary/Cargo.toml b/crates/mdbook-summary/Cargo.toml
index 7315091e..94a59248 100644
--- a/crates/mdbook-summary/Cargo.toml
+++ b/crates/mdbook-summary/Cargo.toml
@@ -8,6 +8,11 @@ repository.workspace = true
 rust-version.workspace = true
 
 [dependencies]
+anyhow.workspace = true
+log.workspace = true
+memchr.workspace = true
+pulldown-cmark.workspace = true
+serde.workspace = true
 
 [lints]
 workspace = true
diff --git a/crates/mdbook-summary/src/lib.rs b/crates/mdbook-summary/src/lib.rs
index 72021842..cacb753e 100644
--- a/crates/mdbook-summary/src/lib.rs
+++ b/crates/mdbook-summary/src/lib.rs
@@ -1,3 +1,5 @@
+//! Summary parser for mdBook.
+
 use anyhow::{Context, Error, Result, bail};
 use log::{debug, trace, warn};
 use memchr::Memchr;
diff --git a/src/book/book.rs b/src/book/book.rs
index 1242c625..e7f92f4e 100644
--- a/src/book/book.rs
+++ b/src/book/book.rs
@@ -4,11 +4,11 @@ use std::fs::{self, File};
 use std::io::{Read, Write};
 use std::path::{Path, PathBuf};
 
-use super::summary::{Link, SectionNumber, Summary, SummaryItem, parse_summary};
 use anyhow::{Context, Result};
 use log::debug;
 use mdbook_core::config::BuildConfig;
 use mdbook_core::utils::bracket_escape;
+use mdbook_summary::{Link, SectionNumber, Summary, SummaryItem, parse_summary};
 use serde::{Deserialize, Serialize};
 
 /// Load a book into memory from its `src/` directory.
diff --git a/src/book/mod.rs b/src/book/mod.rs
index d3433b4e..07e2b4d2 100644
--- a/src/book/mod.rs
+++ b/src/book/mod.rs
@@ -7,16 +7,15 @@
 
 mod book;
 mod init;
-mod summary;
 
 pub use self::book::{Book, BookItem, BookItems, Chapter, load_book};
 pub use self::init::BookBuilder;
-pub use self::summary::{Link, SectionNumber, Summary, SummaryItem, parse_summary};
 
 use anyhow::{Context, Error, Result, bail};
 use log::{debug, error, info, log_enabled, trace, warn};
 use mdbook_core::config::{Config, RustEdition};
 use mdbook_core::utils;
+pub use mdbook_summary::{Link, SectionNumber, Summary, SummaryItem, parse_summary};
 use std::ffi::OsString;
 use std::io::{IsTerminal, Write};
 use std::path::{Path, PathBuf};