diff --git a/lightning/src/util/indexed_map.rs b/lightning/src/util/indexed_map.rs
index 3d45172517d..2b5bbac0ddc 100644
--- a/lightning/src/util/indexed_map.rs
+++ b/lightning/src/util/indexed_map.rs
@@ -21,6 +21,8 @@ use core::ops::{Bound, RangeBounds};
 /// actually backed by a [`HashMap`], with some additional tracking to ensure we can iterate over
 /// keys in the order defined by [`Ord`].
 ///
+/// (C-not exported) as bindings provide alternate accessors rather than exposing maps directly.
+///
 /// [`BTreeMap`]: alloc::collections::BTreeMap
 #[derive(Clone, Debug, Eq)]
 pub struct IndexedMap<K: Hash + Ord, V> {
@@ -147,6 +149,8 @@ impl<K: Hash + Ord + PartialEq, V: PartialEq> PartialEq for IndexedMap<K, V> {
 }
 
 /// An iterator over a range of values in an [`IndexedMap`]
+///
+/// (C-not exported) as bindings provide alternate accessors rather than exposing maps directly.
 pub struct Range<'a, K: Hash + Ord, V> {
 	inner_range: Iter<'a, K>,
 	map: &'a HashMap<K, V>,
@@ -161,6 +165,8 @@ impl<'a, K: Hash + Ord, V: 'a> Iterator for Range<'a, K, V> {
 }
 
 /// An [`Entry`] for a key which currently has no value
+///
+/// (C-not exported) as bindings provide alternate accessors rather than exposing maps directly.
 pub struct VacantEntry<'a, K: Hash + Ord, V> {
 	#[cfg(feature = "hashbrown")]
 	underlying_entry: hash_map::VacantEntry<'a, K, V, hash_map::DefaultHashBuilder>,
@@ -171,6 +177,8 @@ pub struct VacantEntry<'a, K: Hash + Ord, V> {
 }
 
 /// An [`Entry`] for an existing key-value pair
+///
+/// (C-not exported) as bindings provide alternate accessors rather than exposing maps directly.
 pub struct OccupiedEntry<'a, K: Hash + Ord, V> {
 	#[cfg(feature = "hashbrown")]
 	underlying_entry: hash_map::OccupiedEntry<'a, K, V, hash_map::DefaultHashBuilder>,
@@ -181,6 +189,8 @@ pub struct OccupiedEntry<'a, K: Hash + Ord, V> {
 
 /// A mutable reference to a position in the map. This can be used to reference, add, or update the
 /// value at a fixed key.
+///
+/// (C-not exported) as bindings provide alternate accessors rather than exposing maps directly.
 pub enum Entry<'a, K: Hash + Ord, V> {
 	/// A mutable reference to a position within the map where there is no value.
 	Vacant(VacantEntry<'a, K, V>),
diff --git a/lightning/src/util/ser.rs b/lightning/src/util/ser.rs
index 14c25775174..bef192585b5 100644
--- a/lightning/src/util/ser.rs
+++ b/lightning/src/util/ser.rs
@@ -89,6 +89,8 @@ impl Writer for VecWriter {
 
 /// Writer that only tracks the amount of data written - useful if you need to calculate the length
 /// of some data when serialized but don't yet need the full data.
+///
+/// (C-not exported) as manual TLV building is not currently supported in bindings
 pub struct LengthCalculatingWriter(pub usize);
 impl Writer for LengthCalculatingWriter {
 	#[inline]
@@ -100,6 +102,8 @@ impl Writer for LengthCalculatingWriter {
 
 /// Essentially [`std::io::Take`] but a bit simpler and with a method to walk the underlying stream
 /// forward to ensure we always consume exactly the fixed length specified.
+///
+/// (C-not exported) as manual TLV building is not currently supported in bindings
 pub struct FixedLengthReader<R: Read> {
 	read: R,
 	bytes_read: u64,
@@ -155,6 +159,8 @@ impl<R: Read> LengthRead for FixedLengthReader<R> {
 
 /// A [`Read`] implementation which tracks whether any bytes have been read at all. This allows us to distinguish
 /// between "EOF reached before we started" and "EOF reached mid-read".
+///
+/// (C-not exported) as manual TLV building is not currently supported in bindings
 pub struct ReadTrackingReader<R: Read> {
 	read: R,
 	/// Returns whether we have read from this reader or not yet.
@@ -289,6 +295,8 @@ impl<T: Readable> MaybeReadable for T {
 }
 
 /// Wrapper to read a required (non-optional) TLV record.
+///
+/// (C-not exported) as manual TLV building is not currently supported in bindings
 pub struct RequiredWrapper<T>(pub Option<T>);
 impl<T: Readable> Readable for RequiredWrapper<T> {
 	#[inline]
@@ -311,6 +319,8 @@ impl<T> From<T> for RequiredWrapper<T> {
 
 /// Wrapper to read a required (non-optional) TLV record that may have been upgraded without
 /// backwards compat.
+///
+/// (C-not exported) as manual TLV building is not currently supported in bindings
 pub struct UpgradableRequired<T: MaybeReadable>(pub Option<T>);
 impl<T: MaybeReadable> MaybeReadable for UpgradableRequired<T> {
 	#[inline]
@@ -591,6 +601,8 @@ impl Readable for [u16; 8] {
 
 /// A type for variable-length values within TLV record where the length is encoded as part of the record.
 /// Used to prevent encoding the length twice.
+///
+/// (C-not exported) as manual TLV building is not currently supported in bindings
 pub struct WithoutLength<T>(pub T);
 
 impl Writeable for WithoutLength<&String> {