diff --git a/rust/README.md b/rust/README.md
index fab7783d8..dacde790a 100644
--- a/rust/README.md
+++ b/rust/README.md
@@ -151,7 +151,8 @@ compression orchestration, public CCtx-copy pledge/frame-parameter policy, and
 public advanced-compression parameter validation/init policy, and public
 usingDict parameter selection, dictionary-presence handling, and default-level
 normalization, and public usingCDict frame-policy construction and begin/end
-sequencing now run in Rust.
+sequencing, and the compressBegin_usingDict family’s unknown-source parameter
+selection and default-level normalization now run in Rust.
 CDict allocation/lifecycle
 machinery, private dictionary-content allocation/loading, reset policy,
 private CCtx/matchfinder/workspace operations, and codec/adaptive-policy