diff --git a/CHANGELOG.md b/CHANGELOG.md
index f8bf4d6..0134095 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,6 +30,10 @@
     - `-...-` → `-`
     - `.--.-.` → `@`
 - `encode_stream`, `encode_stream_ascii` and `decode_stream` now return `Result<(), std::io::Error>`
+- Code refactor and optimizations:
+    - `encode_string_ascii`: 0.97 GiB/s → 1.35 GiB/s (+42%)
+    - `encode_string`: 0.75 GiB/s → 0.82 GB/s (+12%)
+    - `encode_stream`: 0.65 GiB/s → 0.75 GiB/s (+17%)
 
 ## v0.1.0