diff --git a/rust/README.md b/rust/README.md
index 5fe43a311..f712a492c 100644
--- a/rust/README.md
+++ b/rust/README.md
@@ -76,7 +76,9 @@ zstd ABI:
     FSE/Huffman repeat state, and executes compressed-block sequences.
   - `zstd_decompress` owns the public decompression context, one-shot,
     dictionary, parameter, and streaming state machines.  Its C shim retains
-    configuration-dependent context allocation plus legacy and trace leaves.
+    the configuration-dependent context layout and platform details, plus
+    legacy and trace leaves; Rust owns decoder storage allocation and custom
+    memory dispatch.
 - Command-line frontend
   - `zstd_cli` owns the Rust parser, safety policy, and dispatch.  It is built
     by the separate `cli/` static-library package only for program archives,