diff --git a/Cargo.lock b/Cargo.lock
index 126871b..c14201d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -465,17 +465,11 @@ dependencies = [
  "powerfmt",
 ]
 
-[[package]]
-name = "embassy-futures"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1f878075b9794c1e4ac788c95b728f26aa6366d32eeb10c7051389f898f7d067"
-
 [[package]]
 name = "embassy-sync"
-version = "0.6.2"
+version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8d2c8cdff05a7a51ba0087489ea44b0b1d97a296ca6b1d6d1a33ea7423d34049"
+checksum = "cef1a8a1ea892f9b656de0295532ac5d8067e9830d49ec75076291fd6066b136"
 dependencies = [
  "cfg-if",
  "critical-section",
@@ -827,7 +821,6 @@ version = "0.1.0"
 dependencies = [
  "crc",
  "defmt",
- "embassy-futures",
  "embassy-sync",
  "embedded-io-adapters",
  "embedded-io-async",
diff --git a/mctp-estack/Cargo.toml b/mctp-estack/Cargo.toml
index 2fa4f23..caabca8 100644
--- a/mctp-estack/Cargo.toml
+++ b/mctp-estack/Cargo.toml
@@ -16,8 +16,7 @@ log = { version = "0.4", optional = true }
 crc = "3"
 embedded-io-async = { workspace = true }
 defmt = { workspace = true, optional = true }
-embassy-sync = "0.6"
-embassy-futures = "0.1"
+embassy-sync = "0.7"
 smbus-pec = { version = "1.0", features = ["lookup-table"] }
 uuid = { version = "1.16.0", default-features = false }
 
diff --git a/mctp-estack/src/lib.rs b/mctp-estack/src/lib.rs
index 6709dbe..f621613 100644
--- a/mctp-estack/src/lib.rs
+++ b/mctp-estack/src/lib.rs
@@ -3,14 +3,13 @@
  * Copyright (c) 2024-2025 Code Construct
  */
 
-//! MCTP Stack
+//! # MCTP Stack
 //!
 //! This crate provides a MCTP stack that can be embedded in other programs
-//! or devices. A [`Stack`] handles MCTP message formatting and parsing, independent
-//! of any particular MCTP transport binding.
+//! or devices.
 //!
 //! A [`Router`] object lets programs use a [`Stack`] with
-//! MCTP transport binding links. Each "port" handles transmitting and receiving
+//! MCTP transport binding links. Each *Port* handles transmitting and receiving
 //! packets independently. Messages destined for the stack's own EID will
 //! be passed to applications.
 //!
@@ -18,6 +17,9 @@
 //! instances to communicate over MCTP. Those implement the standard [`mctp` crate](mctp)
 //! async traits.
 //!
+//! The IO-less [`Stack`] handles MCTP message formatting and parsing, independent
+//! of any particular MCTP transport binding.
+//!
 //! ## Configuration
 //!
 //! `mctp-estack` uses fixed sizes to be suitable on no-alloc platforms.
@@ -30,6 +32,8 @@
 
 /// Re-exported so that callers can use the same `heapless` version.
 ///
+/// `heapless::Vec` is currently an argument of `send_fill()` in transports.
+///
 /// TODO: will be replaced with something else, maybe `heapless::VecView` once
 /// released.
 pub use heapless::Vec;
@@ -39,15 +43,16 @@ use heapless::FnvIndexMap;
 use mctp::{Eid, Error, MsgType, Result, Tag, TagValue};
 
 pub mod control;
-mod fragment;
+pub mod fragment;
 pub mod i2c;
 mod reassemble;
 pub mod router;
 pub mod serial;
 pub mod usb;
+#[macro_use]
 mod util;
 
-pub use fragment::{Fragmenter, SendOutput};
+use fragment::{Fragmenter, SendOutput};
 use reassemble::Reassembler;
 pub use router::Router;
 
@@ -80,8 +85,6 @@ pub(crate) const HEADER_LEN: usize = 4;
 /// during the build. Those variables can be set in the `[env]`
 /// section of `.cargo/config.toml`.
 pub mod config {
-    use crate::get_build_var;
-
     /// Maximum size of a MCTP message payload in bytes, default 1032
     ///
     /// This does not include the MCTP type byte.
@@ -142,6 +145,9 @@ type Header = libmctp::base_packet::MCTPTransportHeader<[u8; HEADER_LEN]>;
 #[derive(Debug)]
 pub struct ReceiveHandle(usize);
 
+/// Low level MCTP stack.
+///
+/// This is an IO-less MCTP stack, independent of any particular transport.
 #[derive(Debug)]
 pub struct Stack {
     own_eid: Eid,
diff --git a/mctp-estack/src/util.rs b/mctp-estack/src/util.rs
index 9d707b1..3b1fdb3 100644
--- a/mctp-estack/src/util.rs
+++ b/mctp-estack/src/util.rs
@@ -1,7 +1,6 @@
 /// Takes a `usize` from a build-time environment variable.
 ///
 /// If unset, the default is used. Can be used in a const context.
-#[macro_export]
 macro_rules! get_build_var {
     ($name:literal, $default:expr) => {{
         match option_env!($name) {
diff --git a/mctp/src/lib.rs b/mctp/src/lib.rs
index defa638..90fb229 100644
--- a/mctp/src/lib.rs
+++ b/mctp/src/lib.rs
@@ -10,7 +10,7 @@
 #![forbid(unsafe_code)]
 #![warn(missing_docs)]
 
-//! Management Component Transport Protocol (MCTP)
+//! # Management Component Transport Protocol (MCTP)
 //!
 //! This crate provides common types and traits for MCTP.
 //! Transport implementations can implement [`ReqChannel`] and [`Listener`] to
diff --git a/standalone/src/serial.rs b/standalone/src/serial.rs
index d0076d1..6256942 100644
--- a/standalone/src/serial.rs
+++ b/standalone/src/serial.rs
@@ -16,7 +16,8 @@ use smol::Timer;
 
 use mctp::{Eid, Error, MsgType, Result, Tag, TagValue};
 use mctp_estack::{
-    serial::MctpSerialHandler, MctpMessage, ReceiveHandle, SendOutput, Stack,
+    fragment::SendOutput, serial::MctpSerialHandler, MctpMessage,
+    ReceiveHandle, Stack,
 };
 
 struct Inner<S: Read + Write> {