diff --git a/rust/README.md b/rust/README.md
index 1f7fdcccd..88e34734a 100644
--- a/rust/README.md
+++ b/rust/README.md
@@ -99,8 +99,9 @@ zstd ABI:
   - `zstd_cli` owns the Rust parser, safety policy, and dispatch.  It is built
     by the separate `cli/` static-library package only for program archives,
     so library builds do not acquire program-only dependencies.  The C
-    `fileio` layer retains format-specific codec callbacks and metadata, while
-    Rust owns the mixed-format probe/dispatch loop. Rust already owns the file
+    `fileio` layer retains the remaining format-specific codec callbacks and
+    metadata, while Rust owns the mixed-format probe/dispatch loop and gzip
+    codec leaf. Rust already owns the file
     preference policy, filename decisions, source/destination opening,
     dictionary buffers, asynchronous I/O pools, and pass-through copy leaf.
   - `timefn` provides the monotonic nanosecond clock behind `UTIL_time_t`,
@@ -112,11 +113,12 @@ zstd ABI:
     feature, because the parser layer requires the C `fileio` backend that
     tests do not compile.
 
-High-level frame-compression orchestration, multithreaded job scheduling and
-flush orchestration, and several format-specific CLI codec paths are still C.
-They must move before the rewrite is complete. Keeping that boundary explicit
-prevents a passing hybrid build from being mistaken for the final all-Rust
-result.
+Generic high-level frame-compression state-machine orchestration,
+multithreaded job scheduling and the remaining outer flush orchestration, and
+the xz/lzma/lz4 CLI codec paths are still C. The frame epilogue, produced-output
+flush policy, and gzip codec leaf now run in Rust. The remaining C paths must
+move before the rewrite is complete. Keeping that boundary explicit prevents
+a passing hybrid build from being mistaken for the final all-Rust result.
 
 ## Legacy decoding