diff --git a/Documentation/releases/coreboot-4.10-relnotes.md b/Documentation/releases/coreboot-4.10-relnotes.md
index b8e0373f86..9a6d63c16c 100644
--- a/Documentation/releases/coreboot-4.10-relnotes.md
+++ b/Documentation/releases/coreboot-4.10-relnotes.md
@@ -10,3 +10,15 @@ notes.
  release notes for the general format.
 * The chip and board additions and removals will be updated right
 before the release, so those do not need to be added.
+
+Significant changes
+-------------------
+
+### `device_t` is no more
+coreboot used to have a data type, `device_t` that changed shape depending on
+whether it is compiled for romstage (with limited memory) or ramstage (with
+unlimited memory as far as coreboot is concerned). It's an old relic from the
+time when romstage wasn't operated in Cache-As-RAM mode, but compiled with
+our romcc compiler.
+
+That data type is now gone.