diff --git a/bench/BINARY_SIZE.md b/bench/BINARY_SIZE.md
index 2c960d76f7..493c99359a 100644
--- a/bench/BINARY_SIZE.md
+++ b/bench/BINARY_SIZE.md
@@ -23,6 +23,7 @@ Solana version: 2.1.0
 ### Notable changes
 
 - lang: Use closures for `init` constraints to reduce the stack usage of `try_accounts`. Note that the binary size increase is exaggerated for the bench program because it uses unusual number of `init` constraints. Impact for normal programs will be a lot less severe. ([#2939](https://github.com/coral-xyz/anchor/pull/2939)).
+- Upgrade to Solana `2.1.0`. This upgrade decreased the binary size ~5% (55,000 bytes) ([#3339](https://github.com/coral-xyz/anchor/pull/3339)).
 
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