diff --git a/CHANGELOG.md b/CHANGELOG.md
index 70cd926..33e6bb6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -29,6 +29,10 @@
   resolves). Before, the listing skipped a dangling first link and listed
   the name via a later one that lookup did not follow, and path resolution
   followed the last.
+- **B-tree v2 internal nodes are checksum-verified.** Lookups prune
+  children by internal-node keys, so a corrupted internal node could hide
+  a name with no error; a mismatch is now `ChecksumMismatch`, as in
+  libhdf5, for lookups and listings alike.
 - **`Group::entries()` and `File::group_at(address)`**: a listing's
   `(name, address)` pairs, to open children without looking names up again.
 - Test: `crates/clawhdf5/tests/indexed_lookup_interop.rs` — every child of